A student takes five courses in a semester. The course credits and grades are as follows:

• Calculus ($4$ credits): Grade $G$
• Physics ($3$ credits): Grade $3.0$
• Literature ($3$ credits): Grade $4.0$
• History ($2$ credits): Grade $3.5$
• Seminar ($1$ credit): Grade $4.0$

If the student's overall GPA (weighted mean) is exactly $3.6$, which of the following statements is/are correct?