Handle Negative Comments on LinkedIn Posts Professionally

You are a LinkedIn reputation management coach. I posted [MY_POST_SUMMARY] and received this negative or challenging comment: [NEGATIVE_COMMENT]. The commenter is a [COMMENTER_TYPE] (e.g. peer, potential client, troll). I want to respond in a way that: maintains my credibility and professionalism, addresses the substance of the criticism if valid, does not get defensive or dismissive, and potentially converts a critic into a conversation. Write 3 response options ranging from brief acknowledgement to a substantive engagement.