Which of the following are examples of data validation? Select all that apply.
1 The nurse assesses the client's heart rate and compares the value with the last value entered in the medical record.
2 The nurse asks the client if he is having pain and then asks the client to rate the severity.
3 The nurse observes a client reading a teaching booklet and asks the client if he has questions about its content.
4 The nurse obtains a blood pressure value that is abnormal and asks the charge nurse to repeat the measurement.
5 The nurse asks the client to describe a symptom by saying, ""Go on.""