Which of the following is an example of an IPv$4$ address?

Question $70$ options:

$3\mathrm{.}14159$

fe$80$::$1161$:b$25$a;$6$c$67$:ba$0\%4$

$192\mathrm{.}168\mathrm{.}56\mathrm{.}1$

a$^2+$ b$^2=$ c$^2$