Observability of a system is essential for

(A) finding a solution to the state equation.

(B) finding a suitable model in state space.

(C) transferring the state of the system from any initial value to any specified final value.

(D) state estimation.

(A) finding a solution to the state equation.

(B) finding a suitable model in state space.

(C) transferring the state of the system from any initial value to any specified final value.

(D) state estimation.