Doubt from reduction

plz explain 2 and 3 with mechanism for 11.5

  1. NaBh4 is a weaker reducing agent than LiAlH4 so it reduces ketone to alcohol but doesn’t react with ester, for mechanism , simply attack H- like a nucleophile on carbonyl carbon

Will this be OH or CH3 ?!

Yes this is it exactly what is confusing me. You can see the solution. It was in NCERT.

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