What is the maximum number of lookup relationships that a single object can have in Salesforce?

In Salesforce, a single object can have a maximum of 25 lookup relationships. Lookup relationships are a type of relationship that allows you to link one object to another without requiring the two objects to be tightly coupled. They are useful for establishing a one-to-many relationship between records of different objects.

Having a limit of 25 lookup relationships per object provides flexibility while still maintaining the integrity and performance of the Salesforce database. This allows you to create complex data models that relate various entities in your organization without overwhelming the system's capabilities.

The other options suggest higher limits which exceed the defined boundaries of the Salesforce platform as of the last update. Thus, the correct answer must reflect the official limit set by Salesforce documentation, making 25 the accurate and validated choice.