Answer:
The categories of slaves that could not be found on plantation are the overseer and the teachers.
Explanation:
The overseers are those who lead the slaves to the plantation;
They keep watch over, control and direct the work of others; The overseers can't be categorised as slaves as they are in charge of punishing the slaves by whipping, shackling, beating, mutilating, branding, and/or even giving them jail terms.
While the slaves under the category of the teacher also can't be found in plantations because of their assigned and designated duties
