Some students were not involved in the strike.
If the above statement is true, which of the following conclusions is/are logically necessary?
- Some who were involved in the strike were students.
- No student was involved in the strike.
- At least one student was involved in the strike.
- Some who were not involved in the strike were students.
- $1$ and $2$
- $3$
- $4$
- $2$ and $3$