What type of content cannot be altered after its creation?

The correct choice is fixed content, as it refers to a type of content that remains unchanged after its initial creation. Fixed content is established in such a way that it does not undergo any modifications, ensuring consistency and reliability for users. This type of content is often used for referential materials like legal documents, contracts, or certain types of scientific texts where accuracy and stability are essential.

Active content, on the other hand, refers to content that can change or be altered dynamically, often based on user interaction. Static content does not change but can often be edited or updated when needed, though the content itself may remain the same each time it is accessed. Dynamic content is designed to adjust to user behaviors or preferences, allowing for a personalized experience that can change frequently. These characteristics differentiate fixed content from the other types, emphasizing its permanence and reliability.