When deploying Apex code to production, the following considerations are required:
Option B: All triggers must have at least one line of test coverage.
Salesforce mandates that every trigger has some test coverage.
Salesforce requires that 75% of your Apex code is covered by tests.
Reference:
"All Apex code must have 75% test coverage, and all triggers must have some test coverage in order to be deployed to production."
- Salesforce Help: Deployment Testing Requirements
Option C: At least 75% of Apex code must be covered by unit tests.
"At least 75% of your Apex code must be covered by unit tests, and all of those tests must complete successfully."
- Salesforce Help: Deployment Testing Requirements
Why Other Options Are Incorrect:
Option A: Deploying during business hours is not a technical requirement and may not be best practice due to potential impact on users.
Option D: While using System.assert is good practice, it's not a strict requirement for deployment.