Judging from this picture, what is the definition for a new moon?

An illustration of four phases of the moon, Quarter Moon is shaped like a capital D, Full Moon is a circle, Crescent is shaped like a backwards C, and New Moon is a solid black circle

Question 10 options:

a time when the moon is not visible

a time when only half of the moon is visible

a time when half of the sunlit side of the moon can be seen

a time when the whole sunlit side of the moon can be seen

a time when the whole sunlit side of the moon cannot be seen