Question

One story cannot have all three storytelling techniques within it. True False

Answer 1

The Answer to your question is:

False.

"because the author can write the book however they want"

Side note:

"Talking about: chronological written in the order that events occur in real time flashback a change in the storytelling order where the current action flashes back to the past flash forward a change in the storytelling order where the current action flashes to the future"

Quoted answers are NOT Mine.  I take NO credit/responsibility for this answer. 

Further information / sources may be provided at:

http://openstudy.com/updates/5302985de4b024fe26e2b550

I am only here to help, Not to get into trouble.  I hope you understand.