Determine the Degree of the Polynomial $2 x ^ { 6 } - 8 x ^ { 7 } + 9 x ^ { 2 } - 7$

Determine the degree of the polynomial.
- $2 x ^ { 6 } - 8 x ^ { 7 } + 9 x ^ { 2 } - 7$

A) 7
B) 15
C) 4
D) 6