You need to create a timer job that queries a list

You need to create a timer job that queries a list. What should you do?

A.
Create a class that inherits SPJobDefinition and override the Provision method.

B.
Create a class that inherits SPJobDefinition and override the Execute method.

C.
Create a class that inherits SPServiceApplicationand override the Provision method.

D.
Create a class that inherits SPServiceApplicationand override the Provisionlnstances method.

Explanation: