Which explains verb mood?

It is how a verb is used to make a command.

It is how a verb is used to ask a question.

It is how a verb is used to state a fact.

It is how a verb is used to express a thought.

It is how a verb is used to express the attitude or feeling of the speaker towards what is being said. It can indicate whether the statement is a fact, a possibility, a command, a wish, a suggestion, or a condition, among others.

The correct explanation of verb mood is: "It is how a verb is used to express a thought."