Write a SQL expression for each of the following operations:

a) Find the IDs of all the students who are enrolled in COMP 314.

b) Find all distinct names of students who are enrolled in COMP 314. In other words, show each name only once (i.e., eliminate duplicate student names).

Consider a student database with the following schema: Students (SID, sName); Courses (cID, Name); Enrolled (sID, ID, sectID, grade) where foreign key (SID) references Students, foreign key (CID) references Courses