Please Help? I'm stuck on this..

The owner of a large company is conducting a survey about job satisfaction, including questions about salary, hours, stress, and other conditions. There are about 800 employees in the company, including 100 executive positions, middle-management positions, and 650 custodial positions. The owner wants to include about 10% of his employees in the survey sample.

Identify a sampling method that would lead to a representative sample for the survey. Explain why it would be a good choice and give details about the process.

Question

Please Help? I'm stuck on this..

The owner of a large company is conducting a survey about job satisfaction, including questions about salary, hours, stress, and other conditions. There are about 800 employees in the company, including 100 executive positions,  middle-management positions, and 650 custodial positions. The owner wants to include about 10% of his employees in the survey sample. 

Identify a sampling method that would lead to a representative sample for the survey. Explain why it would be a good choice and give details about the process.