i$.$In error detection and correction methods $($Section $3\mathrm{.}7),$ what is the key difference between the forward error correction $($FEC$)$ and automatic repeat request $($ARQ$)$ schemes?

$(3$ marks$)$

ii$.$The received FEC $75$ message block displayed below uses even parity checks, with the parity bits displayed at the end of each row $($A$$E$)$ and column $(17)$ in the shaded cells $($see Section $3\mathrm{.}7\mathrm{.}1).$ A single bit error has occurred somewhere in this message block.

$$ By checking each row and column, determine the row$-$column grid reference of the bit error.

$$ What change needs to be made to correct the error?

As part of your answer, briefly explain how you located the bit error.

$1234567$

A $0111010$ Highlighted$0$

B $1101011$ Highlighted$0$

C $1111010$ Highlighted$1$

D $1010100$ Highlighted$1$

E $0001100$ Highlighted$0$

Highlighted$1$ Highlighted$0$ Highlighted$1$ Highlighted$0$ Highlighted$0$ Highlighted$1$ Highlighted$1$ Highlighted$0$