JAVA DATA STRUCTURES

24. Nathan was writing a program to store 50000 items. He needed to have fast look-up times, but did not need to have fast insertion times. He decided to go with a Linked List. Name one reason that this was not the correct data structure to use, and name a data structure that would work better. 25. Kelly wants to store some data in her program that concerns iPhone replacement chip shipments. She needs to keep track of the inventory and has labeled each replacement part with a unique key. She is going to have to enter in the new replacement parts periodically, but insertion will rarely be used. She will need to have very fast look-up times to keep up with the ordering system. And deletions are never allowed. Which data structure would be good for Kelly to use, what is her advantage and disadvantage by using this data structure