Answer:
The D simply stands for "day."
Explanation:
The designation was traditionally used for the date of any important military operation or invasion, according to the National World War II Museum. Thus, the day before June 6, 1944, was known as D-1 and the days after were D+1, D+2, D+ and so on.
Renaissance artist Filippo Brunelleschi discovered the principle of First Perspective. (2 words) This gives the illusion of 3D space to 2D art, which makes objects appear either farther away or closer in the artwork.
This should be right,
if not feel free to correct me.
Isn’t it like cost and demand or price and demand