Which equation describes how the parent function, [tex]y=x ^{3} [/tex], is vertically stretched by a factor of 4?
A.) y=[tex]y=x^{3}+4[/tex]
B.) [tex]y=(x+4)^{3} [/tex]
C.) [tex]y=4x^{3} [/tex]
D.) [tex]y=x^{4} [/tex]