How does the linear attribution model calculate credit?

Equal credit is assigned to all interactions that occurred before the conversion.
22.5% of credit to the first interaction, the interaction that created the contact, the interaction that created the deal, and to the interaction that closed the deal. The final 10% is assigned to the remaining interactions evenly.
More credit is given to interactions that happen closer in time to the conversion.
All credit is assigned to the last interaction that led to a conversion like a closed won deal.

The correct answer is:

Equal credit is assigned to all interactions that occurred before the conversion.