Which entity is used to track changes to data over time?

Which entity is used to track changes to data over time?

• A. Contacts
• B. Patients
• C. Visits
• D. Billing

Answer: (A)

Tracking changes to data over time relies on keeping a history of how values change and when they change. The Contacts entity is a natural place for this because contact details (phone numbers, addresses, relationships) are the kinds of fields that frequently update. By storing these details in an entity where updates are timestamped and previous values can be retained, you can trace how contact information has evolved over time. The other options don’t inherently serve this historical role: a patient represents the person, visits are events, and billing reflects financial activity. They don’t by themselves provide a built-in history of data changes.

Tracking changes to data over time relies on keeping a history of how values change and when they change. The Contacts entity is a natural place for this because contact details (phone numbers, addresses, relationships) are the kinds of fields that frequently update. By storing these details in an entity where updates are timestamped and previous values can be retained, you can trace how contact information has evolved over time. The other options don’t inherently serve this historical role: a patient represents the person, visits are events, and billing reflects financial activity. They don’t by themselves provide a built-in history of data changes.