1) What is a tree node that has no children called?: A) Null B) Empty C) Descendant D) Leaf E) Trunk 2) Consider the following method written in pseudocode. This is an example of what?: * public String methodl (String :) if sis null, empty, or a single character then return 3; else String temp - methodl (s except for the first character) + the first character of s. return temp: A) Recursion B) Iteration C) Inheritance D) Enumeration E) Polymorphism