Which of these addresses represents a valid IPv$6$ global unicast address?

a$.2001$::$1$::FEA

b$.$ FE$80$::$2$cab:$2$a$76$:$3$f$57$:$8499$

c$.169\mathrm{.}254\mathrm{.}12\mathrm{.}1/64$

d$.$ FF::$1$:$2$

e$.2001$:$0$:$4137$:$9$e$74$:$2$cab:$2$a$76$:$3$f$57$:$8499$