Cost basis of inherited demutualized Prudential shares

My husband and I each received Prudential stock in separate accounts as part of the Prudential demutualization many many years ago. Upon my husband’s recent death in 2023, I inherited The Prudential demutualized stock that was in my deceased husband’s account, and the shares went into my account.
I’ve been told the original cost basis was at zero when given years ago.

Do I use the “step up” method and find the FMV on the day of his death?? Is the FMV at the time I inherited the stock what I would use as the cost basis to determine gain now that I am selling those shares??

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