Identify the Expression as a Polynomial or Not a Polynomial $5 x ^ { 2 } y ^ { 3 } + 4 x ^ { 3 } y + 5 x$

Multiple Choice

Identify the expression as a polynomial or not a polynomial.
- $5 x ^ { 2 } y ^ { 3 } + 4 x ^ { 3 } y + 5 x$

A) Not a polynomial
B) Polynomial