**Identify the sentence that is grammatically incorrect and conveys a different meaning compared to the others:**

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**Solution:**

1. The sentences (b), (c), and (d) indicate that the AAP is currently making efforts to reconcile with “rebels” and “former leaders” by reaching out to ex-Punjab convener Sucha Singh Chhotepur.

2. Sentence (a), however, suggests that the AAP has already completed the efforts to make peace and then reached out to Sucha Singh Chootepur, which changes the intended meaning.

3. Additionally, sentence (a) contains a grammatical error: the subject "The AAP" is singular, but it is followed by the auxiliary verb "have," which is used with plural subjects. The correct auxiliary should be "has."

4. Sentences (b), (c), and (d) correctly use "has" and convey the intended meaning of ongoing efforts.

5. Therefore, sentence (a) is both grammatically incorrect and semantically different from the others.

**Answer:** (a)

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