Answer:
D. Obtain a waiver of documentation of informed consent.
Step-by-step explanation:
The most helpful approach to protect the subject identity is to obtain a waiver of documentation of informed consent, with this, the researcher does not need the subjects signature and name of the subject on the consent form hence the subjects identity is protected, or the consent form can be entirely waived, or the documentation of the subjects consent form can also be waived. It is a provision by the IRB.