Observe that the type of [fold] is parameterized by _two_ type variables, [X] and [Y], and the parameter [f] is a binary operator that takes an [X] and a [Y] and returns a [Y]. Can you think of a situation where it would be useful for [X] and [Y] to be different

Fast answer i need for apex ! smartphones should be banned from the classroom in public schools so that students cannot cheat on test so easily? which is an example of a counter argument to the thesis above? a.the classroom is a place for learning not for making phone calls b. smartphones are useful learning tools in the modern classroom c.banning smartphones will not students pay attention to teachers any better d. banning smartphones would decreased incidents of theft