Q17. If $M _ { o }$ is the mass of isotope ${ } _ { 5 } ^ { 12 } B , M _ { P }$ and $M _ { n }$ are the masses of proton and neutron, then nuclear binding energy of isotope is :\\
(1) $\left( M _ { o } - 5 M _ { p } \right) C ^ { 2 }$\\
(2) $\left( 5 M _ { p } + 7 M _ { n } - M _ { o } \right) C ^ { 2 }$\\
(3) $\left( M _ { 0 } - 12 M _ { n } \right) C ^ { 2 }$\\
(4) $\left( M _ { o } - 5 M _ { p } - 7 M _ { n } \right) C ^ { 2 }$