1) Represent the given Entity Relationship diagram as a relational database schema using a textual schema summary. Use the attribute names as indicated on the ER diagram. 2) Indicate the candidate key(s) of each relation. 3) For each relation list foreign key(s) (if any) and the primary key for each foreign key references. Also, the resulting design should avoid redundancy and the use of null values. 4) Use this description as a model for textual schema summary for other relations in the database schema. The textual schema summary for relation courseoffering relation is provided as a sample. examples: courseoffering(semester, year, regNumber, oInstructor, cDept, cNumber, cTitle) foreign key (cDept, cNumber, cTitle) references course(cDept, cNumber, cTitle) Please help me understand what candidate keys, foreign keys, and primary keys are and how to create a textual schema summary..