The Rest Mass of a Proton Is 1

The rest mass of a proton is 1.0072764666 u and that of a neutron is 1.0086649158 u. The ³¹P nucleus weighs 30.973761 u. Calculate the total binding energy of the nucleus.

A) 2.662 × 10^-11 joule
B) 2.801 × 10^-12 joule
C) 1.0978 × 10^-10 joule
D) 4.090 × 10^-11 joule
E) 4.212 × 10^-8 joule