What is the output of this program?

class output {
public static void main(String args[])
{
char c[]={'a','1','b',' ','A','0'];
for (int i = 0; i < 5; ++i) {
if(Character.isDigit(c[i]))
System.out.println(c[i]" is a digit");
if(Character.isWhitespace(c[i]))
System.out.println(c[i]" is a Whitespace character");
if(Character.isUpperCase(c[i]))
System.out.println(c[i]" is an Upper case Letter");
if(Character.isUpperCase(c[i]))
System.out.println(c[i]" is a lower case Letter");
i = i + 3;
}
}
}

a) a is a lower case Letter

is White space character

b) b is a lower case Letter

is White space characte

c) a is a lower case Letter

A is a upper case Letter

d) a is a lower case Letter

0 is a digit