Concerning Third Party Consent to Search, in Which of the Following

Concerning third party consent to search, in which of the following situations can one person consent to a search for the other person?

A) a janitor consenting to the search of the employer's premises
B) a school administrator consenting to the search of a guidance counselor's locked desk containing confidential records
C) a factory owner consenting to a search of items on top of an employee's workbench
D) a landlord consenting to the search of a tenant's apartment