A galvanometer has a resistance of $50 \Omega$ and it allows maximum current of 5 mA. It can be converted into voltmeter to measure upto 100 V by connecting in series a resistor of resistance.\\
(1) $5975 \Omega$\\
(2) $20050 \Omega$\\
(3) $19950 \Omega$\\
(4) $19500 \Omega$