You are troubleshooting a performance issue with a Compute Engine instance that is part of a managed instance group serving a web application. Users report intermittent high latency. You run the command shown in the exhibit. Based on the output, what is the most likely cause of the performance issue?
Exhibit
Refer to the exhibit.
```
$ gcloud compute instances describe instance-1 --zone=us-central1-a
...
networkInterfaces:
- accessConfigs:
- name: external-nat
natIP: 34.123.45.67
type: ONE_TO_ONE_NAT
name: nic0
network: https://www.googleapis.com/compute/v1/projects/my-project/global/networks/default
subnetwork: https://www.googleapis.com/compute/v1/projects/my-project/regions/us-central1/subnetworks/default
...
disks:
- autoDelete: true
boot: true
deviceName: instance-1
diskSizeGb: '100'
interface: SCSI
source: https://www.googleapis.com/compute/v1/projects/my-project/zones/us-central1-a/disks/instance-1
type: PERSISTENT
...
serviceAccounts:
- email: 123456789-compute@developer.gserviceaccount.com
scopes:
- https://www.googleapis.com/auth/devstorage.read_only
- https://www.googleapis.com/auth/logging.write
- https://www.googleapis.com/auth/monitoring.write
- https://www.googleapis.com/auth/servicecontrol
- https://www.googleapis.com/auth/service.management.readonly
- https://www.googleapis.com/auth/trace.append
```Trap 1: The instance is hitting the network egress bandwidth limit.
No evidence of network throttling; the instance has a standard external IP and typical egress limits for its machine type.
Trap 2: The service account lacks the necessary scopes for Cloud Monitoring…
The service account has monitoring.write and trace.append scopes, which are adequate for sending metrics and traces.
Trap 3: The boot disk is too small, causing I/O contention.
A 100GB persistent disk is sufficient for typical web server operations; disk I/O is unlikely the bottleneck unless there is heavy logging.
- A
The instance is under-provisioned for CPU.
The output does not show the machine type, but the disk size and service account suggest a small instance, likely with 1 vCPU. Insufficient CPU causes high latency under load.
- B
The instance is hitting the network egress bandwidth limit.
Why wrong: No evidence of network throttling; the instance has a standard external IP and typical egress limits for its machine type.
- C
The service account lacks the necessary scopes for Cloud Monitoring and Cloud Trace.
Why wrong: The service account has monitoring.write and trace.append scopes, which are adequate for sending metrics and traces.
- D
The boot disk is too small, causing I/O contention.
Why wrong: A 100GB persistent disk is sufficient for typical web server operations; disk I/O is unlikely the bottleneck unless there is heavy logging.