Can we please agree what we mean by �Big Bang�?

Can you answer the following question?

At the Big Bang the observable universe had the size of:


A) A point (no size).
B) A grapefruit.
C) 168 meters.

The right answer would be �all of the above.� And that�s not because I can�t tell a point from a grapefruit, it�s because physicists can�t agree what they mean by Big Bang!
For someone in quantum gravity, the Big Bang is the initial