Explanation:
The correct option is a. The direct anterior approach (historically the Smith-Petersen approach) is favored by many because it is the only true internervous and intermuscular approach to the hip joint. The superficial dissection exploits the interval between the tensor fasciae latae (which is innervated laterally by the superior gluteal nerve) and the sartorius (which is innervated medially by the femoral nerve). The deeper dissection passes between the gluteus medius and the rectus femoris. This avoids detachment or denervation of the primary dynamic muscle stabilizers of the hip. Reference: Campbell's Operative Orthopaedics, 14th Edition.