Which of the following are the advantages of a balanced

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Which of the following are the advantages of a balanced bridge vacuum tube voltmeter in comparison with a conventional VTVM?
1. Higher input impedance
2. Meter zero has less tendency to shift
3. Effects of changes due to variation of valve characteristics are minimised
4. Power supply fluctuations have a smaller effect on the measuring circuit. Select the correct answer using the codes given below: Codes:

1. 3 and 4
2. 1 and 2
3. 1, 2 and 3
4. All of these

Correct Option: D

The following advantages of a Balanced bridge vacuum tube voltmeter in comparison with a conventional VTVM are:
● Higher input impedence.
● High regulation to supply i.e. power supply fluctuations have a smaller effect on the measuring circuit.
● Meter zero has less tendency to shift.
● Effects of changes due to variation of value characteristics are minimised.