What sampling techniques are these?

Jack walks around campus recruiting individuals until he nds 8 J ack-in-the-Box lovers and 2 McDonalds lovers. Mazie is interested in surveying boys and girls in elementary school. She would ideally like to survey all 500 boys and 500 girls but does not have the time or resources. Instead she is randomly selecting 50 girls and 50 boys to survey. Tobias is interested in determining whether Arlington loves dogs or cats. He knows that 250,000 citizens love d_og and 300,000 citizens love cats. Tobias then selects his population based on the proportions of each cat or dog lover in Arlington. Breezes is interested in how the State of Texas feels about peanut butter. She divides Texas into different subgroups based on county lines. She then randomly selects 50 counties within Texas and randomly samples om the selected counties