What is a factor that you should consider before constructing a fireline?

a. When creating a fireline, a straight line is always preferable.
b. Wildland firefighting always trumps restrictions on private or protected land.
c. If there is the potential for burning materials rolling down the hill and crossing the fireline, move the line elsewhere.
d. Sometimes, when the fire is burning really hot, you will just have to back off and cut line a safe distance from the fire.