Which Statement Is True Regarding the Following Code, Assuming Reader

Multiple Choice

Which statement is true regarding the following code, assuming reader is a FileInputStream object?
Char ch = (char) reader.read() ;
I you cannot determine if you have reached the end of input
II this code will throw an exception if we are at the end of input
III read returns an int, so the cast is illegal

A) I
B) II
C) III
D) I and II