$($c$)"$If the hedge ratio $h$ is equal to $1$ or $-1,$ then the desired commodity's price

changes and the futures' changes are perfectly correlated, whence the hedge

is perfect". True or False? Explain your answer.

$($d$)"$If the hedge is perfect, then the hedge$-$ratio must be equal to $1$ or $-1".$ True

or False? Explain your answer.