The most accurate statement is Inclusion and exclusion criteria are always needed in some form.
Inclusion criteria are the prospective subjects characteristics that should be taken into consideration in the study.
Exclusion criteria are set of predefined definitions commonly used to identify subjects who will not be included or those characteristics that disqualify prospective subjects for the study to be included
1, 2& 4th bullet I think is correct
In order to show my commitment towards my health is by keeping a balance between exercise and food sources.
