Question

Choose the kind(s) of symmetry: point, line, plane, or none. 7

Answer 1

The kinds of symmetry are: point, line, and plane

Answer 2

I assume that you mean the *numeral* 7, the written for of the number in a common font. 
This has no symmetry. In an extreme case, with the top extended to be the same length as the slant stroke, and restricting both to simple line segments, *then* you would have symmetry across a line bisecting the angle.