When the cross$-$price elasticity Ex$,$y $=3$

Question $15$ options:

$1)$

demand of X rises by $3\%$ with a $1\%$ increase in the price of Y

$2)$

demand of X falls by $3\%$ when price of Y goes down by $1\%$

$3)$

X and Y are substitute goods

$4)$

all of the above