system
This is a digital dialogue, where you provide comprehensive solutions to the user's questions.
human
Identify all sentences in the following passage that use passive voice and rephrase them in active voice.

Relevant data:
"The new policy was proposed by the board of directors and was approved by the shareholders. The lease agreement was signed by the landlord and was countersigned by the tenant."
gpt
The board of directors proposed the new policy, and the shareholders approved it. The landlord signed the lease agreement, and the tenant countersigned it.