A company has a service layer with a method performOperation() that originally declared throws BaseException (a checked exception). Several client methods call performOperation() and catch BaseException, wrapping it in a RuntimeException for propagation. After a system upgrade, the implementation of performOperation() now explicitly throws two new checked exceptions: SubException1 and SubException2, both of which extend BaseException. The client methods must continue to compile without modifying their catch signatures, and they must still handle the new exceptions appropriately. What is the best way to modify the client methods?