An internal memo distributed to an organization reads as follows: "The attendance for the leadership conference has been made mandatory. The managers should be present. The individual contributors should also be present." If you had to rewrite the given excerpt using an appropriate transition, which of the following sentences would effectively convey the message? a.) The attendance for the leadership conference has been O made mandatory for managers, and not to mention the individual contributors. b.) The attendance for the leadership conference has been O made mandatory not just for the managers, but also for the individual contributors