The IEEE $802\mathrm{.}3$z Gigabit Ethernet standards use $8$b$/10$b encoding.

a$.$ Provide a brief description of $8$b$/10$b encoding process. $(4-8$ sentences$)$

b$.$ How does $8$b$/10$b ensure DC balance?

c$.$ How does $8$b$/10$b provide clock recovery $($synchronization$)?$