Answer:
General Partnership
Step-by-step explanation:
The legal concept of General Partnership obliges two or more signing partners -Lisa and John in this case- to share all assets, all liabilities, and to be responsible for all matters related to the business, regardless of who signs a contract, or contracts new debt, or acquires a new asset, and so on.
So under this legal concept, even if John did not sign the lease, he is still legally responsible for it.