You have been dispatched for an 89-year-old female patient who fell in her kitchen and was found by family members several hours later. Should something go awry on scene, which of these serves to give you the most safety and security?

A) Notifying dispatch that you are at the residence
B) Ensuring that lights are on throughout the residence
C) Backing the ambulance into the driveway for rapid egress
D) Carrying a portable radio with you into the house

D) Carrying a portable radio with you into the house