Which of the following is not a type of lead used in a 12-lead ECG?

The receptionist's nails should be well trimmed, and only ________ polish should be used

a. black b. clear c. pink d. red

The medical emergency care rider covers __________ treatment sought and received for sudden, severe, and unexpected conditions that if not treated would place the patient's health in permanent jeopardy or cause permanent impairment or dysfunction of an organ or body part

a. continuous b. immediate c. protracted d. recurring