What is an example of appropriate security measures when using the fax to send $\frac{?}{\text{P}\text{H}\text{I}}?$

have a signed form authorizing the release of $\frac{?}{\text{P}\text{H}\text{I}}$ before releasing the information

a cover sheet containing warning of confidential information is necessary when faxing

always recheck before sending the fax that the correct telephone number was selected and entered correctly

all of the above