The following are shortcomings associated with analyzing problems "one factor at a time" (also known as OFAT and 1FAT) except:
Select one:
A. In real life it is almost impossible to hold all other factors constant
B. Experimental designs specify levels for each factor to be included
C. It is very hard to account for interactions or joint variation between factors
D. Though graphing results is helpful to observe different factors, it is hard to graph variation of more than two or three variables at the time
