Answer:
1) Partially disclosed principal
Explanation:
A partially disclosed principal refers to a person whose identity is not known but the other negotiating party knows that he/she exists. This person may be the seller or buy of a property and the reasons for keeping their identities unknown are several and they range from being public figures to simply people who want to act mysteriously.
On the other hand, when the name of the principal is given to the other party, he/she is said to be a disclosed principal.