For class $B$ network, all even bit positions are selected for subnet mask bits. What is the possible subnet mask?
$(A) 255.25.170.170$
$(B) 255.255.85.85$
$(C) 255.255.255.240$
$(D)$ None
In this question, my doubt is how we can assign subnet mask like this can we? Subnet bits should be taken in continuation from host bits right?