Explanation:$setUnion performs set operation on arrays, treating arrays as sets. 7. Which of the following performs a relative complement of the second set relative to the first ?
A. $setIntersection
B. $setDifference
C. $setEquals
D. $setUnion
Answer:A
Explanation:$setUnion performs set operation on arrays, treating arrays as sets. 7. Which of the following performs a relative complement of the second set relative to the first ?
A. $setIntersection B. $setDifference C. $setEquals D. $setUnion
Explanation:$setDifference returns a set with elements that appear in the first set but not in the second set. 8. $setIsSubset	returns _______ if all elements of the first set appear in the second set, including when the first set equals the second set.