Indicate the correct administration of adrenaline 1 mg in the following scenarios:
a) A patient is in cardiac arrest. Ventricular fibrillation has been refractory to a second shock.
b) A patient presents pulseless electrical activity after the first shock.
c) An unconscious patient with a palpable pulse of 40 bpm.
d) Patient suffers an anaphylactic reaction with shock and airway swelling.