Which of the following is good coding practice to determine oddity?

[answerhappygod]

i)
public boolen abc(int num){ return num % 2 == 1;}
ii)
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2,
3,
4,
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9,
10
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public boolean xyz(int num){ return (num & 1)!= 0; }
a) i
b) ii
c) (i) causes compilation error
d) (ii) causes compilation error