Consider the following nuclear reaction and select the correct statements from the options that follow.

Reaction I:  $n\to p+\overline{e}+\overline{v}$

Reaction II:  $p\to n+\stackrel{+}{e}+v$

Inside a nucleus, reaction I is not possible but reaction II is possible  

Free neutron has higher mass than proton, therefore reaction II is not possible outside the nucleus

Inside a nucleus, both decays (reaction I and II) are possible

Free proton has less mass than neutron, therefore reaction I is possible outside the nucleus