Which of the following statements are correct for the A/D converters:a) The advantage of using a dual-slope A/D converter in a digital voltmeter is that its accuracy is high.b) The number of comparators in a 4-bit flash A/D converters is 15.c) The minimum number of comparators required to build an 8-bit flash A/D converter is 256.d) The number of comparators required in a 3-bit comparator type A/D converters is 8.

• A. (a), (c) and (d) are correct
• B. (b) and (c) are correct
• C. (a) and (b) are correct
• D. (a), (b), (c) and (d) are correct