A large company that has eight branches across the country wishes to find out what employees think of a new vacation policy that has recently been introduced. The company plans to survey opinion by randomly selecting and surveying 20 employees from each of the eight branches. What sort of sample results from the sampling design is being used? Please indicate your choice.

Simple random sample snowball sample convenience sample systematic sample voluntary response sample intercept sample cluster sample opt-in sample stratified sample quota sample judgement sample