Which of the studied data structures in this course would be most appropriate for the following tasks? And Why? a) A training institute needs to maintain a database of 2000 identification numbers of trainees who received an ICDL certification. The goal is to find rapidly whether or not a given ID is in the database. Ordering information among the identification numbers is not important; speed of response is very important; efficient use of memory is also important, but not as important as speed of response. Data Structure Why? b) Input/output buffer is an area of a computer memory used to temporarily store data and instructions transferred into and out of a computer, permitting several such transfers to take place simultaneously with processing of data. Instructions are processed according to the arrival time and they are executed one by one. Data Structure Why