A 42-year-old man from Mumbai presents with a 6-month history of a painless swelling in the left groin that extends above the inguinal ligament and into the scrotum. On examination, the swelling is above and lateral to the pubic tubercle. The swelling is reducible and the patient reports a history of intermittent discomfort during heavy lifting. Which of the following is the most likely anatomical defect responsible for this hernia?