For which use case do you create a new rule in a Pega Platform application?

For which use case do you create a new rule in a Pega Platform application?

A designer reuses a UI section every time the same behavior is needed in the application.
A . A developer makes changes to an email message that is configured in the case life cycle.
B . A designer uses Design mode at runtime to modify a view to use a two-column template.
C . A developer creates a parallel process to audit the changes that a service agent makes.
D . A developer creates a parallel process to audit the changes that a service agent makes.

Answer: A