Answer
See the explanation
Work Step by Step
a. To find which branches offer the course IT665, you can use the following SQL query:
```sql
SELECT BName
FROM Branch
WHERE ID = 'IT665';
```
b. To list all the branches present in the Branch relation, you can use the following SQL query:
```sql
SELECT DISTINCT BName
FROM Branch;
```
c. To find which branches offer 4-credit courses, you can use the following SQL query:
```sql
SELECT DISTINCT BName
FROM Branch
WHERE Credits = 4;
```
