Discussion
What does an amplifier described as unity-gain stable guarantee?
Answer: D
Unity-gain stable means the internal compensation gives an adequate margin in the worst case, with a feedback fraction of one and hence the largest possible loop gain. It says nothing about the accuracy of a follower's gain, does not guarantee any particular bandwidth figure, and certainly does not cover any load - a capacitive load can destabilise the most carefully compensated device. A guarantee's exact scope matters, and this one covers the feedback fraction rather than the load.
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