Except, that a proxy may confer discretionary authority as to matters as to which choice is not specified pursuant to item (4), above, if the form conspicuously states how it is intended to vote the proxy or authorization in each such case, and may confer discretionary authority as to other matters which may come before the meeting but unknown for a reasonable time prior to the solicitation by the persons on whose behalf the solicitation is made.
18 Del. C. § 4918