Which operator can be used to concatenate two lists in Python?

The operator used to concatenate two lists in Python is the plus sign (+). When you use this operator between two lists, it combines the elements of both lists into a single list. For example, if you have two lists, list1 = [1, 2, 3] and list2 = [4, 5, 6], using list1 + list2 will produce a new list: [1, 2, 3, 4, 5, 6]. This operation does not modify the original lists; instead, it creates a new list that contains the contents of both.

The other operators listed do not perform concatenation on lists. The minus sign (-) is typically used for arithmetic subtraction and does not apply to lists. The asterisk (*) can be used for repetition of a list (e.g., list1 * 2 would yield [1, 2, 3, 1, 2, 3]), rather than concatenation. The forward slash (/) is used for division and is not applicable to lists either. Thus, the plus sign is indeed the correct and sole operator for concatenating two lists in Python.