vornich of the following is considered subnet ID $($SN$.$ ID$)$ for a sub$-$network with $/27?$

a$.69\mathrm{.}90\mathrm{.}55\mathrm{.}64$

b$.69\mathrm{.}90\mathrm{.}55\mathrm{.}32$

c$.$ Any of the choices

d$.69\mathrm{.}90\mathrm{.}55\mathrm{.}128$

e$.69\mathrm{.}90\mathrm{.}55\mathrm{.}192$