If open paren x minus 5 close paren is a factor of f of x , which of the following must be true?
A
A root of f of x is x is equal to negative 5 .B
A root of f of x is x is equal to 5 .C
Neither x is equal to negative 5 nor x is equal to 5 is a root of f of x .D
Both x is equal to negative 5 and x is equal to 5 are roots of f of x .