Write the following queries in relational algebra, using the university database schema below:

UNIVERSITY DATABASE SCHEMA

a$.$ Find the ID and name of each instructor in the Accounting department.

b$.$ Find the ID and name of each instructor in a department located in the building "Watson".

c$.$ Find the ID and name of each student who has taken at least one course in the "Comp. Sci." department.

d$.$ Find the ID and name of each student who has taken at least one course section in the year $2017.$

e$.$ Find the ID and name of each student who has not taken any course section in the year $2017.$