A surprise quiz contains three multiple choice questions; question $1$ has $3$ suggested answers, question $2$ has four, and question $3$ has two. A completely unprepared student decides to choose the answers at random. If $X$ is the number of questions the student answers correctly, the expected number of correct answers is
- $15 / 12$
- $7 / 12$
- $13 / 12$
- $18 / 12$
- None of the above