What workflow action might cause this behavior?

Universal Containers wants to automate a business process using workflow. They are aware that workflow rules may cause recursive behavior, and as a result certain actions will only cause workflow rules that didn’t fire previously to be retriggered.

What workflow action might cause this behavior? (Choose two.)
A . Workflow Field updates with the "Re-evaluate Workflow Rules After Field Change" field selected.
B . Workflow Tasks where the "Due Date" field is set to "Rule Trigger Date" minus X Days.
C . Workflow Outbound Messages with the "Protected Component" field selected.
D . Workflow E-mails containing hard-coded links with Salesforce IDs referencing specific workflow rules.

Answer: AB