Comprehensive and Detailed in Depth Explanation:In ArchiMate,Capabilitiesdefine theabilities of an organizationto achieve a specific objective, whileRequirementsrepresentconditions or needsthat must be met.
TheAssigned Torelationship is used to linkcapabilities to requirements, indicating that acapability fulfills a requirement. TheRealizationrelationship is also valid because capabilitiesrealize higher-level requirements by providing the necessary means to achieve them.
TheArchiMate 3.2 Specificationstates that aCapability can be assigned to a Requirement and can also realize a Requirement.
References:
* Archi User Guide
* ArchiMate 3.2 Specification

Based on the ArchiMate 3 documents or objectives, a business actor represents a business entity that is capable of performing behavior. A business actor is a business entity as opposed to a technical entity; i.e., it belongs to the Business Layer. The notation for a business actor is a circle with a stick figure inside it. The Chief Marketing Officer in this diagram is a business actor that performs the behavior assigned to the Marketing Manager role.