Answer:
When taking your pulse, your fingertips should touch your first tendon (option a).
Step-by-step explanation:
To take a pulse, place the tips of your index and middle fingers on the inside of your wrist, just below the base of your thumb. You should be able to feel your pulse by pressing gently with your fingertips on the first tendon of your wrist, which is located just below the thumb. Do not use your thumb to take your pulse as it has its own pulse, which could interfere with an accurate reading.