Describe the roots of the polynomial function shown below:

A) A root of -3 with a multiplicity of 2 & a root of 1 with a multiplicity of 1
B) A root of -3 with a multiplicity of 1 & a root of 1 with a multiplicity of 1
C) A root of -3 with a multiplicity of 2 & a root of -1 with a multiplicity of 2
D) A root of -3 with a multiplicity of 1 & a root of 1 with a multiplicity of 2