What are the principles of sustainment? a. Mass, objective, offensive, security, economy of force, maneuver, unity of effort, suitability, and survivability b. Agility, initiative, depth, synchronization, versatility, anticipation, simplicity, feasibility, and force projection c. Integration, anticipation, responsiveness, simplicity, economy, survivability, continuity, and improvisation d. Distribution, transportation, force health protection, health service support, aerial delivery, and supply