A Salesforce administrator is designing a data model and needs to know the maximum number of custom fields allowed on a single standard object. What is that limit?

Correct answer: 800

Option C is correct because Salesforce enforces a limit of 800 custom fields per standard object, as documented in Salesforce platform limits. Option A is incorrect because 100 significantly understates the actual platform limit. Option B is incorrect because 500 is not the documented limit for standard objects; it may be confused with limits on other metadata types. Option D is incorrect because Salesforce does enforce a hard cap on custom fields per object; custom fields are not unlimited.