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2. A constraint which represents a target value for a problem is called a a. fuzzy constraint. b. vague constraint. c. preference constraint d. soft constraint

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Answer: soft constraint

Step-by-step explanation:

The soft constraint is defined as

  • a constraint on a random variable (X)that permits overruling the constraint.
  • a function from the domains in its scope(set of variables ) into a real number.

Hence, a constraint which represents a target value for a problem is called a soft constraint.

Thus the correct option is d. soft constraint.

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