Trying to have add different number of days based on a date

Having trouble figuring out how to write a formula to show a due date of +45 days if the request came in before 3/1/26 or +90 days if the request came in on or after 3/1/26. Column B will have all the request dates already filled in and I want column C to have the due dates on it. Not sure if possible, but I’ve tried different formulas and all cause the #SPILL! Error. ☹️☹️

Any advice on this?