Which of the following expressions is correct in case of a \(CsCl\) unit cell (edge length 'a')? [JEE Main 2023, 15 Apr …

\(
r _{ Cs ^{+}}+ r _{ Cl ^{-}}=\frac{ a }{\sqrt{2}}
\)

\(
r _{ Cs+ }+ r _{ Cl }= a
\)

\(
r _{ Cs ^{+}}+ r _{ Cl ^{-}}=\frac{\sqrt{3}}{2} a
\)

\(
r _{ Cs ^{+}}+ r _{ Cl ^{-}}=\frac{ a }{2}
\)