5. (15 pts.) Consider the following state space model. 1 l 0 .00 x: 000 000 y=0001x (a) Is the system reachable? Show your work completed by hand. (b) Is the system observable? Show your work completed by hand. (c) Is the system reachable if B : l l l l T ? (d) Is the open loop system stable, neutrally stable, or unstable