Answer :

A. Φ {a, b}


We know that null set is subset to every other non-empty set. So, it is true.


B. Φ {a, b}


Null set consists of no elements, but here it contains elements. So, it is false


C. {a} {a, b}


In the above {a} {a, b} not {a} {a, b} since they are given as set but not element.


D. a {a, b}


In the above {a} {a, b} not {a} {a, b} since they are given as element but not as set.


So, option(A) is the correct answer.

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