Question: Please answer question in regaurds to programming language prolog:A unifier of two terms is a term that is an instance of both terms, meaning it

Please answer question in regaurds to programming language prolog:A unifier of two terms is a term that is an instance of both terms, meaning it can be obtained by substituting variables.

Given Prolog terms foo

(a, b)

and foo

(x, x),

select the term that is a unifier.

foo

(a, a)

foo

(b, b)

foo

(x, x)

foo

(a, b)

All of the above

None of the above

Please answer question in regaurds to programming language prolog:A unifier of

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individualism, which is reflected in non-conformity rather than competitiveness, but needing group consensus in order to make a stand;

the view that meetings are important and managers expected to be good communicators;

an element of formality in the workplace between different levels;