Which of the following are true of ecg electrodes? (circle all that apply) a.) impedence increases as area increases b.) capacitor-like impedance is more desirable than resistor-like impedance c.) electrolyte gel is often used to minimize motion artifacts d.) the rc impedance of the electrode tip requires the use of a negative capacity compensation amplifier e.) source impedances of 20-50 kω are typical f.) they typically include an uninsulated barb to create a stable mechanical connection with the cardiac muscle