Yes, No, or Not Applicable

Three answers, with strict meanings. Yes when an objective is met by any means, no when it applies and is not met, and not applicable only when the thing it governs does not exist in the resource.

Three answers

AnswerIt meansExample
YesThe objective is met: by the team's own configuration, by a central or shared control, or by a compensating control.Sign-in is handled by the organization's single sign-on service.
NoThe objective applies to this resource and is not met.The application can enforce session timeouts, and they have not been turned on.
Not applicableThe thing the objective governs is absent from the resource.A privacy objective, for a system that holds no personal information.

Two common mistakes

"We don't manage that." If a central service or another team meets the objective for the resource, the answer is yes. Not applicable would hide a control the resource depends on.

"The product can't do that." If the objective applies and the product lacks the capability, the answer is no. A missing feature never excuses a control.

Not applicable belongs to the resource

Not applicable is a property of the resource, and has nothing to do with how the organization divides its work. It is correct only when the subject of the objective does not exist there: an application with no user accounts, or a system with no personal data.

Marking an objective not applicable removes it from the resource's scope. Used loosely, it makes coverage look better than it is.

What a no leads to

A no is the start of a decision. The team can close the gap, put a compensating control in place, or accept the risk and record that it has. All three keep the gap visible.

When a Team Reports a Gap describes how the security office should respond.