Question $8(1$ point$)$

An elementary school was looking for feedback from the school children's parents about a new disciplinary plan they were using in their school. Every parent was sent an email with a survey attached. After two months, the results of the surveys sent in by parents were reviewed. The results of this survey $...$

Select the best statement.

would be subject to non$-$response bianm

relied on voluntary responses causing a bias to exist in the data collected both answers above are true

none of the answers above are true