In assessing a 1-day-old male newborn, the nurse observes that the scrotal sac is large, swollen, smooth, and taut. Which assessment technique should the nurse perform to determine if the newborn has a hydrocele?

Grasp high on the sac and gently palpate downward to feel each testis present.

Observe daily for the resolution of scrotal edema influenced by placental hormones.

Palpate for a soft, mushy structure that is nontender and distinct from a normal testis.

Perform transillumination of the scrotal sac to visualize a red glow of fluid around the testes.