Mutt's Amazing Dogs Offers a Hot Dog with Mustard and a Hot

Multiple Choice

Mutt's Amazing Dogs offers a hot dog with mustard and a hot dog with relish and mustard. The difference between the two (the relish) is achieved by flipping a single lever, which changes the dispenser from mustard, to a perfectly proportioned mix of relish and mustard. This lever responds instantly to the feathery touch of Mutt, who provides his customers a high level of:

A) mix flexibility.
B) volume flexibility.
C) delivery flexibility.
D) changeover flexibility.