What is the main disadvantage of the stairstep-ramp A/D converter?

[A].	The counter must count up from zero at the beginning of each conversion sequence, and the conversion time will vary depending on the input voltage.
[B].	It requires a counter.
[C].	It requires a precision clock in order for the conversion to be reliable.
[D].	All of the above

Answer: Option A

Explanation:

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