Which is the polynomial function of lowest degree with rational real coefficients, a leading coefficient of 3 and roots square root of 5 and 2 ?
A
f of x is equal to x squared minus 7 x plus 10B
f of x is equal to 3 x cubed minus 6 x squared minus 15 x plus 30C
f of x is equal to x cubed minus 2 x squared minus 5 x plus 10D
f of x is equal to 3 x squared minus 21 x plus 30