Fill in the blank with the functional interface from java.util.function that allows the code to compile and print 3 at runtime. _____________ transformer = x -> x;

A. Function

B. UnaryOperator

C. ToIntFunction

D. IntUnaryOperator

E. The code does not compile regardless of what functional interface is placed in the blank.

F. The code is capable of compiling, but since prime is an OptionalInt value, it cannot be 3 at runtime.

var prime = List. of (3,1,4,1,5,9) .stream() .limit (1) .peek (s -> {}) .mapToInt (transformer) .peek (s -> {}) .sum(); System.out.println(prime);