The CEO of Digital Enterprise, Inc. promises to pay Digital Enterprise's employees a year$-$end bonus if fourth quarter profits "continue the trend set by the first three quarters" and next year's forecast "looks good." This is a$($n$)$:

$$ Not a contract, meaning it is uncertain and lacks consideration.

$$ Output contract in the sense that employee performance will largely determine whether the bonus will be due and payable.

$$ Enforceable contract by Digital's employees but only if they bring their lawsuit as a class action with the three most senior non$-$management employees as the class representatives.

$$ Option contract at the election of Digital's management.

$$ Enforceable contract by any one of Digital's employees.