Please indicate what is true about functional programming langauge $($FPL$)$

The objective of the design of a FPL is to mimic the von newman archtecture to the greatest extent possible

in FPL$,$ variables are not necessary

the functional form apply$-$to$-$all is a functional form that takes two functions as parameters and yields a function whose value is the first actual parameter function applied to the application of the second

Originally, FPL only have the following object data types: set, dictionaries, and tuples