Which principle of ethics emphasizes moderation and balance?

Rex Ingram's film, The Four Horsemen of the Apocalypse, with Rudolph Valentino, is characterized by

a. visual beauty. b. intense dislike of close-ups. c. both a and b. d. neither a nor b.

The ________ is a regular member of the group who engages actively in its discussions, but at the same time critically reflects the group's processes and needs.

Fill in the blank(s) with the appropriate word(s).