What's missing from this state machine implementation? $($Assume main function and while loop are defined off screen$)$

typedef enum $\{$

WAIT,

LOAD,

EXEC,

STORE

$\}$ STATE;

STATE mode;

switch$($mode$)\{$

case$($LOAD$)$:

break;

$\}$

Group of answer choices

The initial state is not defined.

Not all states are handled in the switch$-$case statement.

There is no default case to handle undefined states.

All of the above.

None of the above.