In the Wheatstone's bridge shown, \[P=2\,\Omega ,\] \[Q=3\,\Omega ,\] \[R=6\,\Omega \] and \[S=8\,\Omega \]. In order to obtain balance, shunt resistance across 'S' must be [SCRA 1998]

• A.            \[2\,\Omega \]
• B.                    \[3\,\Omega \]
• C.                    \[6\,\Omega \]
• D.                    \[8\,\Omega \]