Find the Degree of the Polynomial Function $$f ( x ) = 5 x - x ^ { 4 } + \frac { 5 } { 4 }$$

Multiple Choice

Find the degree of the polynomial function.
- $$f ( x ) = 5 x - x ^ { 4 } + \frac { 5 } { 4 }$$

A) 1
B) 5
C) $- 1$
D) 4