During transmission, a $1-$bit error occurs, and a bit in Word $2$ is flipped. The second bit

of Word $2($from the left$)$ is flipped from $1$ to $0,$ changing the word from

$1100001110111000$ to $1000001110111000.$

$$ Recalculate the $1\text{'}$s complement checksum with this flipped bit in Word $2.$

$$ Explain how the receiver detects this $1-$bit error using the $1\text{'}$s complement

checksum method, assuming the original checksum was correctly calculated

before the error occurred.