Answer:
Change his OS
Explanation:
He cam just change his server's OS so that it fits the software's requirements
Answer:
b. LinkedHashSet
Explanation:
A LinkedHashSet is an ordered version of HashSet that maintains a doubly-linked List across all elements. When the iteration order is needed to be maintained this class is used. LinkedHashSet maintains a linked list of the entries in the set, in the order in which they were inserted.
Ust be C. visuals if not then D