V.T.V.M. is superior to conventional voltmeter becausea) it has high input impedanceb) it enables the measurement of low a.c. and d.c. voltagesc) it enables measurement of high frequency voltagesSelect your answer from the following:

• A. ‘a’ alone is true
• B. ‘b’ alone is true
• C. ‘a’ and ‘b’ are true
• D. ‘a’, ‘b’ and ‘c’ are all true