The sign of g′(x) for a differentiable function g is given by the table below.
Interval (-∞,−3) (−3,1) (1,4) (4,∞)
Sign of g′(x) + − + −
At x=−3,1, and 4, g′(x)=0. At which x–value does g attain a relative minimum?
a) x=4
b) x=1
c) x=−3
d) x=−3 and 4