Which two means does the commander have for engaging enemy land forces?

The correct answer focuses on the methods of engaging enemy land forces through air operations, specifically air interdiction and close air support.

Air interdiction refers to strikes designed to disrupt or destroy enemy forces and resources before they can engage friendly ground forces. This method allows commanders to shape the battlefield by preventing enemy units from maneuvering and supplying themselves, effectively neutralizing threats before they can impact friendly operations.

Close air support, on the other hand, is aimed at providing direct assistance to ground troops engaged in combat. This could involve airstrikes on enemy positions that are threatening friendly forces or providing quick responses to immediate ground threats. Close air support plays a critical role in enhancing the effectiveness of ground operations and ensuring the safety of the troops on the battlefield.

Both air interdiction and close air support are essential elements of a commander's toolkit for engaging and neutralizing enemy land forces, making this combination the most appropriate choice in the context of the question.