A). 75% Test Coverage:Salesforce mandates that 75% of all Apex code must be covered by tests to be deployable to production.
D). Trigger Coverage:Each Apex trigger must have at least one line of test coverage to ensure it is properly tested.
Reference:Testing Apex Code
Incorrect Options:
B:Assertions (System.assert) are recommended but not required.
C:Deployment during business hours is not a requirement.