a) if(a!=null)
b) if(a!null)
c) if (!a)
d) if(a!==null)
Answer: d
Explanation: A strict comparison (e.g., ===) is only true if the operands are of the same type and the contents match. The more commonly-used abstract comparison (e.g. ==) converts the operands to the same type before making the comparison. The not-equal operator !== compares 0 to null and evaluates to either true or false.
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