It should be 'who'.

Interested in Language
Hello,
I came across the following sentence in the Yahoo/Forbes News story - Duke Heirs Caught in Billion-Dollar Fortune Battle
Fighting over control of trusts and estates is not limited to billion-dollar fortunes. That's why the choice of whom is to serve as executor or trustee is always a critical component of proper estate planning.
Should this be 'who is to serve as executor'? Or it this correct use of 'whom'?
Thank you
It should be 'who'.
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