After appropriately treating the patient, you press the "analyze" button again. The patient is still in cardiopulmonary arrest. The AED informs you that no shock is indicated. You should:

a.) deliver another electrical countershock.
b.) terminate resuscitation efforts immediately.
c.) continue CPR for 2 minutes and then "reanalyze" the rhythm.
d.) administer sublingual nitroglycerin and continue CPR.
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Before delivering the shocks with the AED, you must ensure that:

a.)the patient is wearing rubber-soled shoes.
b.)no one is touching the patient or the stretcher.
c.)oxygen bottles are at least 20 feet away from the patient.
d.)anyone touching the patient is wearing rubber-soled shoes.