which of these is the correct definiton of the active voice?

a. the form of a verb that shows the manner or mode in which a thought is expressed
b. the verb form that gives a command or advice
c. the voice of a verb in which the subject receives the action of the verb
d. the voice of a verb in which the subject performs the action of the verb

d. the voice of a verb in which the subject performs the action of the verb