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.