Final answer:
Expulsion is considered the most severe penalty a board may impose.
Step-by-step explanation:
The most severe penalty a board may impose is usually expulsion, which is the permanent removal of a student from a school or institution.
Expulsion is typically used as a last resort when a student has committed a serious offense that cannot be resolved through other disciplinary measures. For example, if a student is found guilty of a violent act, significant property damage, or repeated and severe violations of school policies, expulsion may be considered.