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In the following scenario, what might cause PC$0$ and PC$3$ not to communicate? $[$Choose two$]$

a$.$ The IP address of PC$3$ should be $192\mathrm{.}168\mathrm{.}10\mathrm{.}13/24$

b$.$ The switches must be hubs

c$.$ The network mask is not properly set for the two subnets

d$.$ The default gateway in the PCs is missing or incorrect