Ans : $D$) Security is high
a. In Star topology, more number of cables are required compared to Ring topology. For ‘$n$’ devices, Star topology requires ‘$n$’ cables, which connect to a central hub. Ring topology, where there is no central hub, requires ‘$n-1$’ cables for connecting $n$ devices. Mesh topology requires $\frac{n(n-1)}{2}$ cables.
b)The statement is true but it is not an advantage.
c) Distributed topology is different from Star topology. Star topology is a centralized topology.
d) Star topology is designed against point failures affecting the whole network. So its security is high.