Risk Free Rate in option models

what do i use ?
for options expring in 1 month do I use something like 1-month libor ? 3 months using 3 months libor and so on ?
what is the industry standard ?
thanks
 
Treasuries.

Options up to 3 months out generally use a 90 T-bill rate, longer that 3 months use a bill or note with corresponding maturity.
 
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