Which are the type of actions that can be specified for an approval process?

If an approver rejects an approval request, then the final rejection actions are always executed.

New approval steps can be added to an active approval process only if it is deactivated.

Records can enter an approval process based on

Records can enter a step in an approval process based on

Specifying entry criteria is compulsory for

A workflow rule is triggered based on
A) Based on criteria
B) If ‘All records enter this workflow rule’ checkbox is checked, then all records created of
that object would cause the workflow rule to be triggered.

If the record submitted does not meet the entry criteria of any active approval process, then
the record gets rejected.

Rollup summary can be created for

To enforce data consistency using validation rule, which function should be used?