In the context of IPv$6$ Autoconfiguration, when a computer using IPV$6$ for the first time makes a

connection, the computer creates its IPV$6$ address. It uses FE$80$:$/64$ as the first $64$ bits, called the

prefix. The last $64$ bits can be generated in two ways. The first way is where the $64$ bits are

randomly generated. The second way is where the $64$ bits are generated from the network

adapter's MAC $($Medium Access Control$)$ address. Which one of the following statements

regarding the second way is CORRECT?

a$.$ To generate the interface ID$,$ the OS $($Operating System$)$ takes the $48$ bits of the device's

MAC address, inserts a fixed $8-$bit value in the middle of the $48$ bits and inverts the value

of the seventh bit.

b$.$ To generate the interface ID$,$ the OS $($Operating System$)$ takes the $64$ bits of the device's

MAC address, inserts a fixed $8-$bit value in the middle of the $64$ bits and inverts the value

of the seventh bit.

c$.$ MAC addresses consist of $64$ bits and must be converted to the $48-$bit standard, called

EUI$-48($Extended Unique Identifier$-64)$ standard.

d$.$ MAC addresses consist of $48$ bits and must be converted to the $64-$bit standard, called

EUI$-64($Extended Unique Identifier$-64)$ standard.