Directions: For each question below, please select the technique that most closely matches the description.

a$.$ You work for a company as a quality control specialist. You want to check the current production of products for defects. You go down to the factory floor assembly line and randomly choose the first item to inspect. You then inspect every $15$th item that comes off the assembly lines until you have inspected $20$ items.

b$.$ You work for a company as a quality control specialist. You want to check the current production of products for defects. At the end of the day, you assign a number to each item that was produced. You randomly choose $20$ numbers and inspect the items that correspond to the randomly chosen numbers.

c$.$ You work for a company as a quality control specialist. You want to check the current production of products for defects. Your factory has $5$ different assembly lines. At the end of the day, you visit each assembly line and randomly choose four items to inspect.

d$.$ You work for a company as a quality control specialist. You want to check the current production of products for defects. You locate the finished products for the day and inspect the first $20$ items you happen to see.

e$.$ You work for the school newspaper. You want to survey the students for their opinions about a recent issue. During the hour that you have assigned to work on the newspaper, you walk around the school interviewing any students that are available.