DA0-002 Data Governance Practice Question
Network Topology
Refer to the exhibit. A data analyst wants to create a visualization that best shows the trend of sales over time for each department. Which chart type should be used?
⚠ Common exam trap
CompTIA often tests the distinction between showing trends over time versus comparing discrete categories; the trap here is that candidates may choose a grouped bar chart (Option D) because it can display multiple departments, but they overlook that bars are better for comparing values at specific points rather than showing the continuous flow of time.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Line chart with multiple lines.
A line chart with multiple lines is the best choice because it clearly shows the trend of sales over time for each department, with time on the x-axis and sales on the y-axis. Each line represents a department, making it easy to compare trends across departments while preserving the continuous nature of time. This aligns with the goal of visualizing trends, as line charts excel at showing changes over a continuous interval.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Stacked bar chart.
Why it's wrong here
Stacked bars show each department's contribution to a combined total per period, so individual series are read as segments of a cumulative height rather than as their own trajectory. It is tempting because it displays every department at once, and it would be correct for showing how parts compose a whole across periods.
- ✗
Pie chart for each quarter.
Why it's wrong here
A pie chart per quarter encodes each department as a slice of one period's total, giving no positional axis for time and making trends across quarters unreadable. It is tempting because pies clearly show proportional share, and one would be correct for displaying departmental composition within a single quarter.
- ✓
Line chart with multiple lines.
Why this is correct
Multiple lines share one time axis, so each department's sales trajectory is plotted as a continuous series, making trends and divergences visible. This satisfies the stem's requirement to show sales trend over time per department, which categorical charts cannot express.
- ✗
Grouped bar chart.
Why it's wrong here
Grouped bars place categories side by side within each time period, which supports comparison between departments at a single point but fragments the continuous progression needed to read a trend. It is tempting because grouping handles multiple series, and it would be correct for comparing departmental totals within discrete periods rather than tracking change over time.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.