<h3>The option a) all decision variables must be integer is correct.</h3><h3>In an all-integer linear program , <u>all decision variables must be integer</u><u>.</u></h3>
Step-by-step explanation:
In an all-integer linear program , all decision variables must be integer.
<h3>Because :</h3>
In a integer linear program there are two main reasons for using integer variables while modeling problems .
The integer variables represent only the quantities if it is an integer.
The integer variables represent decisions variables and therefore should only take on the value 0 or 1.
<h3>Therefore option a) all decision variables must be integer is correct.</h3>