Select the grammatically correct form of the following sentence from the options below:
The doctor has examining the patient, but she is also reviewing the test results.
1
The doctor have been examining the patient, but she is also reviewing the test results
2
The doctor is examining the patient, but she is also review the test results
3
The doctors are examining the patient, but she is also reviewing the test results
4
The doctor is examining the patient, but she is also reviewing the test results