The standard 3-4 viewing portal for radiocarpal wrist arthroscopy is located between which two extensor compartments?

Explanation:
The correct option is d. The 3-4 portal is the standard initial viewing portal for wrist arthroscopy. It is established just distal to Lister's tubercle, located safely between the extensor pollicis longus (EPL) tendon (3rd dorsal compartment) and the extensor digitorum communis (EDC) tendons (4th dorsal compartment). Reference: Slutsky DJ, J Am Acad Orthop Surg.