What Are the Two Reasons for Granting Criminal Justice Professionals

What are the two reasons for granting criminal justice professionals qualified immunity?

A) (1) to safeguard against rogue officers, and (2) to ensure laws are enforced in a safe and uniform manner
B) (1) to encourage officers to aggressively enforce the law, and (2) to avoid trial
C) (1) to ensure laws are enforced in a safe and uniform manner, and (2) to provide an incentive for passing laws
D) (1) to encourage officers to aggressively enforce the law, and (2) to provide officers with a discretionary power