According to Pega best practices, which phase can you implement as a child case?

The business process for an automobile insurance claim consists of the following phases:

• Submission: The customer contacts a customer service representative (CSR) to file the claim.

• Review: An adjuster reviews the claim, assesses the damages to each vehicle, and provides an estimate of the cost of repairs.

• Repair: A third party performs the repairs on each vehicle, communicating with the adjuster and customer as necessary.

• Verification: After each vehicle repair, the adjuster closes the claim.

According to Pega best practices, which phase can you implement as a child case?
A . Submission
B . Verification
C . Review
D . Repair