Final answer:
The facial marking is located between the borders of the lips, which cover the orbicularis oris muscle involved in mouth movements.
Step-by-step explanation:
The facial marking you are referring to seems to be related to the anatomy of the lips, as it is mentioned to be located between the borders of the philtrum, which is the vertical groove in the middle area of the upper lip, connecting to the nasal septum. Given the options provided, the facial marking in question would most appropriately be located between the borders of the lips. The lips, being an important component of the facial anatomy, cover the orbicularis oris muscle which plays a crucial role in controlling the movements that come in and go out of the mouth, such as food when eating or air when speaking.