Kamino supply and the reserve factor

Kamino's fees page calls the protocol's share a "spread". What is it a percentage of?

• The amount you supplied
• The interest borrowers pay
• The amount borrowers took out

A reserve adds a host fixed rate to every borrow. Who receives that part of the interest?

• Suppliers, in proportion to their deposits
• Split between suppliers and the protocol by the take rate
• The protocol, in full