Which of the following electronic configurations represents the element with the lowest ionization energy?

For the second period elements,the correct increasing order of first ionisation enthalpy is:

In the photoelectric effect,if the work functions of $Li$,$Na$,and $Rb$ are $2.41 \ eV$,$2.30 \ eV$,and $2.09 \ eV$ respectively,the work function of $K$ could approximately be in $eV$?

If the $IP$ of $Na$ is $5.48 \, eV$,the ionisation potential of $K$ will be ............ $eV$.

Generally,the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is

Given below are two statements:
Statement $I$: The first ionization energy of $Pb$ is greater than that of $Sn$.
Statement $II$: The first ionization energy of $Ge$ is greater than that of $Si$.
In the light of the above statements,choose the correct answer from the options given below: