What are the two alternative weekend plans that Mike Freedman is considering?

a) Plan X: Buy the small container on Friday, consume it on Saturday, and exercise vigorously on Sunday.
b) Plan Y: Buy the large container on Friday, consume the first serving on Saturday, consume the rest and exercise vigorously on Sunday, then exercise again on Monday.
c) Plan Z: Buy the large container on Friday, consume both servings on Saturday, and exercise vigorously on Sunday.
d) Another option could be to not buy any ice cream on Friday and instead focus on a different activity for the weekend.