In a pre-election poll in the riding of Quatre Bras in Quebec where 67% of the voters are French-speaking and 33% are English-speaking, 66 voters were randomly selected from the list of English-speaking voters and 134 were randomly selected from the list of French-speaking voters. Then, all 200 chosen voters were surveyed. This type of sampling is called convenience sampling stratified sampling o systematic sampling o cluster sampling o random sampling None of the above