The ionic radius is:

$K^{+}$,$Cl^{-}$,$Ca^{2+}$,and $S^{2-}$ ions are isoelectronic. The decreasing order of their ionic radii is:

Which one of the following indicates the correct order of atomic size of the given elements?

The incorrect decreasing order of atomic radii is:

Which ion has the lowest radius from the following ions?

Given below are two statements:
Statement $I$: The metallic radius of $Na$ is $1.86 \ \mathring{A}$ and the ionic radius of $Na^{+}$ is lesser than $1.86 \ \mathring{A}$.
Statement $II$: Ions are always smaller in size than the corresponding elements.
In the light of the above statements,choose the correct answer from the options given below: