<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:While explaining the effects of hypokalemia and hyperkalemia on the cardiac rhythm, a cardiologist explains that the electrophysiology of cardiac tissue is unique. He mentions that potassium ions play an important role in the electrophysiology of the heart, and the resting membrane potential of the cardiac myocytes is close to the equilibrium potential of K ions. This is because of the high resting potassium conductance of the ventricular myocytes, which is regulated by specific potassium channels. These are open at rest and are closed when there is depolarization. Which of the following potassium channels is the cardiologist talking about?? A: Inward rectifier IK1 potassium channels, B: Inward rectifier IKACh potassium channels, C: Fast delayed rectifier IKr potassium channels, D: Slow delayed rectifier IKs potassium channels, E: Transient outward current Ito potassium channels,  <response>: The question stem describes how potassium ions play an important role in the electrophysiology of the heart. Specifically, it mentions that the resting membrane potential of cardiac myocytes is close to the equilibrium potential of K ions. This is due to the high resting potassium conductance in ventricular myocytes, which is regulated by potassium channels that are open at rest and closed during depolarization. Based on this information, we can deduce that the question is asking about the potassium channel responsible for maintaining the resting membrane potential in ventricular myocytes. The channel needs to be open at rest and closed during depolarization.Reviewing the answer choices, the inward rectifier IK1 potassium channel fits this description. The other potassium channels listed are involved in repolarization or have other functions, but the IK1 channel is responsible for maintaining the resting membrane potential.A: Inward rectifier IK1 potassium channels 