Answer:
look at x=0 and plug in 0 for any x you find in the equation
f(0) = 0² - 4*0 +4 = 4
c is out of the race then
let's do this again, but test for x=1 and x=2
f(1) = 1² - 4*1 + 4 = 1
f(2) = 2² - 4*2 +4 = 0
a and b are out
its graph d
when testing like this, choose easy-to-calculate numbers to find out what points you get when asking for the y-value at an arbitrary x-place
