Which of the following is a valid IPV$6$ address?

a$.$ FE$80$::BD:$1457$:ABCC:$12$A$8$

b$.$ FE$80$:$0000$:$0000$:$00$ GF:$1867$:$2431$

c$.$ FE$80$::BD::$1240$

d$.192\mathrm{.}168\mathrm{.}1\mathrm{.}1$