3. [Abstract Data Types] With reference to all Abstract Data Types (ADT) and data structures learned in the course, please indicate an ADT and a corresponding data structure implementation that would be best suited for each of the following tasks. State your reason(s), and also assumptions where necessary. (12%) a) To serve print jobs in a strictly first-come-first-serve basis for a shared printer b) To look up employee information by unique staff id in a company with 1000s of employees c) To allow customers to search for products within a certain price range among 1,000,000s of company products d) To prioritize computing processes within a multi-task operating system