A WA TV program asks viewers to ring in regarding whether they think Mark McGowan is doing a good job of dealing with COVID-19 in 2022. More than 200,000 people ring in to vote with 72% saying they think he is doing a bad job. Which of the following is correct?

	a.	The results are unreliable as they quite likely suffer from self-selection bias.
	b.	We conclude that the majority of West Australians think he is doing a bad job.
	c.	As long as the number of responses is greater than 5% of the West Australian population, we have overcome any doubts surrounding the validity of this sample.
	d.	The biggest problem with this survey is that people under the voting age may have responded.