Consider the following data in hex: $3$ABA $22$FD $55$FA FFAD a$.(3$ points extra credit$)$ Calculate the checksum data for this data. Lets call the checksum XXXX$.$ Show all internal calculation steps!b$.(3$ points extra credit$)$ If now, the above data and the calculated checksum is transmitted, and the received data is $3$ABA $22$FD $55$AB FFAD XXXX$,$ where XXXX is the calculated checksum in $2$a$),$ verify that an error has been detected. Show all internal calculation steps!