In the course of conducting a valid stop and frisk for weapons, if the police officer discovers evidence of another crime for which an arrest is proper, the officer:
a. may not seize the evidence since the officer originally sought only weapons.
b. may not seize the evidence since probable cause to arrest did not exist at the initiation of the stop and frisk.
c. may seize the evidence since the officer has not exceeded the scope of frisk.
d. must first obtain a warrant for the subject's arrest prior to seizing the evidence.