When mounted and framed, your photograph should not touch what? The mat
The display board
The glass
All of the above

The mat photograph should not touch the glass when your photograph are mounted and framed.

Explanation:

All framing styles fall into three main categories: matted, matless, and float-mounted. Whichever style you choose, be sure that your photograph does not touch the glass once it is mounted and set in the frame.

Whichever style you choose, be sure that your photograph does not touch the glass once it is mounted and set in the frame.