Which of the following should be used as the date of birth for a pet?

• A. Pet's birth date
• B. Last 4 digits of owner's phone number
• C. Pet's breed
• D. Owner's name

Answer: (B)

When entering a pet’s record, having a date field filled with a usable, verifiable value helps with age-related care and record-keeping. If the exact birth date isn’t known, using a stable numeric placeholder is practical. The last four digits of the owner’s phone number provide a four‑digit, numeric code that stays consistent for the same family and doesn’t reveal the full phone number. This gives the system a valid date-like entry without exposing sensitive information, and you can update it later if the real birth date becomes available. Other options don’t fit because they aren’t date-like data or would reveal unnecessary details such as the pet’s breed or the owner’s name.