At DC, G=6,H=2/3 and loop gain GH=4. The closed-loop output/input gain is G/(1+GH)=6/5=1.2. For unit input the tracking error is 1−1.2=−.2, with magnitude .20, D. The comparator error is also magnitude .2 here, although the two errors are conceptually different for non-unity feedback.
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