Final answer:
The operator | is used to find the union of two sets in mathematics. So, option D is correct.
Step-by-step explanation:
The correct operator to find the union of two sets is "|", which represents the bitwise OR operator in many programming languages, including Python. The bitwise OR operator compares the binary representation of each element in the two sets and returns a new set containing all unique elements from both sets. For example, if set A = {1, 2, 3} and set B = {3, 4, 5}, then A | B would result in a new set {1, 2, 3, 4, 5}, as it combines all distinct elements from both sets.
On the other hand, the "-" operator typically represents set difference, "^" represents bitwise XOR, "&" represents bitwise AND. These operators are not suitable for finding the union of sets. The correct use of "|" for union ensures that the resulting set contains all unique elements present in either of the original sets. The caret "^" often represents the bitwise XOR operation, not applicable to sets.