Which types of overhead allocation methods result in the use of more than one overhead rate during the same time period?

a. Plantwide overhead rate method and departmental overhead rate method.
b. Departmental overhead rate method and cost pool overhead rate method.
c. Departmental overhead rate method and activity-based costing.
d. Activity-based costing and plantwide overhead rate method.
e. Cost pool overhead rate method and plantwide overhead rate method.