Usage of whom: The lady whom it was always a pleasure to meet, was there.

[Navi]

Which are correct:

1-The lady whom it was always a pleasure to meet, was there.
2-The lady meeting whom was always a pleasure, was there.
3-The lady to meet whom was always a pleasure, was there.
4-The lady who was always a pleasure to meet, was there.

[Honey2]

4-The lady who was always a pleasure to meet, was there.

because the lady is a subject and takes who
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live quite life