What is the output of the following code:

X$=\{50,20,70,40,10,60\}$

Y $=\{80,40,100,70,90,60\}$

Z$=$ X$-$Y

print$($Z$)$

a$.1-30,-20,-80,0\}$

b$.(-30,-20,-30,-30,-80,0\}$ c$.\{80,90,100\}$ d$.\{20,50,10\}$