This muscle, located deep in the buttock, adducts the thigh; it is the muscle used for dorsagluteal injections:

a. gluteus maximus

b. gluteus medius

c. rectus abdominus

d. vastus lateralis

a. gluteus maximus

Explanation:

The gluteus maximus muscle belongs to the most superficial layer of the dorsal gluteus musculature, being a thick and quadrilateral mass that forms the buttock prominence. Its upper edge is thin and covers the gluteus medius muscle, while its lower edge is prominent and free, moving inferolaterally and being crossed by a horizontal gluteal fold.

This is the muscle used for dorsagluteal injections.