Recursion Tracing Exercise: What the printString method does

Which answer best describes what the printString method below does? void printString(String s) { if (s.length() > 0) { printString(s.substring(1)); System.out.print(s.substring(0, 1)); } }

It prints s in reverse order.

It prints s.
It prints only the first character of s.
It prints only the first two characters of s.
It prints only the last character of string s.

Note that the print command is exectued after the base case is reached when unwinding the recursion.