One story cannot have all three storytelling techniques within it. true false

The Answer to your question is:

False.

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

Side note:

"Talking about: chronologicalwritten in the order that events occur in real time flashbacka change in the storytelling order where the current action flashes back to the past flash forwarda 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.