When there is an open quantity term in an agreement $($when the quantity of items sold are not specified$),$ which of the following statements are true:

Under common law, failure to specify the quantity of items to be bought and sold is fatal, and the contract will fail.

As an exception to the common law rule, the UCC recognizes a "requirements contract" that does not specify the quantity of items to be bought and sold. $q,$

As an exception to the common law rule, the UCC recognizes an "output contract" that does not specify the quantity of items to be bought and sold.

$$ None of the above.

All of the above.