Suppose an ISP owns the block of addresses of the form $130\mathrm{.}119\mathrm{.}50\mathrm{.}128/26.$ Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. Without subneting, how many valid IP address does this ISP have?

a$.254$

b$.510$

c$.$ none

d$.62$

e$.14$

f$.126$

Clear my choice