Salesforce operates on a multi-tenant architecture, where a single instance of the platform serves multiple customers (tenants). Each tenant's data is securely isolated, but they share common resources, such as server space, database instances, and updates. This approach ensures cost efficiency and scalability.

A . Costs more than single-tenant architecture: Multi-tenancy reduces costs due to shared resources.

B . Reserves resources per tenant: Resources are shared rather than reserved individually.

Reference from Salesforce Documentation:

Salesforce Multi-Tenant Architecture Overview

Multi-Tenant vs. Single-Tenant