How many of these methods compile? 

A. Zero

B. One

C. Two

D. Three

E. Four

F. Five

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public class Singing { private void sing (String key) { } public void sing_do (String key, String... harmonies) { this.sing (key); } public void sing_re(int note, String... sound, String key) { this.sing (key); } } public void sing_me (String... keys, String... pitches) { this.sing (key); } public void sing_far (String key, String... harmonies) { this.Singing.sing (key); } public void sing_so(int note, String... sound, String key) { this.Singing.sing (key); } public void sing_la(String... keys, String... pitches) { this.Singing.sing (key); }