Which patient would you consider administering external (transcutaneous) pacing?
a. Patient 1: 70-year-old male with a heart rate of 30 bpm and experiencing syncope
b. Patient 2: 25-year-old female with a heart rate of 65 bpm and chest pain
c. Patient 3: 50-year-old male with a heart rate of 90 bpm and dizziness
d. Patient 4: 40-year-old female with a heart rate of 100 bpm and shortness of breath