Which of the following are the three basic defensive tasks?

The three basic defensive tasks are Mobile Defense, Area Defense, and Retrograde.

Mobile Defense focuses on disrupting the enemy's attack while maintaining the freedom of maneuver, often using reserves to counterattack at critical points. This approach aims to absorb and redirect enemy forces through flexibility and mobility rather than holding a fixed position.

Area Defense emphasizes the protection of a specific geographical area, where forces are positioned to defend against an enemy assault. This task seeks to destroy or incapacitate the enemy within a defined zone, utilizing firepower and fortifications to halt the advance.

Retrograde operations involve the organized withdrawal of forces from enemy engagement while maintaining contact and readiness to counter-attack. Retrograde allows for units to disengage effectively, preserve combat power, and create conditions for future operations.

The other options include tasks or combinations that either do not represent the core defensive tasks or mix elements that do not accurately define how military forces typically organize their defense.