What does the following SQL statement do?
```sql
SELECT firstname, lastname FROM admission.student ORDER BY gpa;
```
a) Retrieves first and last names of students from the admission table, ordered by GPA
b) Retrieves first and last names of students from the student table, ordered by GPA
c) Retrieves all columns from the student table, ordered by GPA
d) Retrieves student information but does not order it by GPA