Under some circumstances, courts do not require consideration for a promise to be enforced. The doctrine used by the courts to bind a promisor is called detrimental reliance or:

Donald is studying the eating habits of all students attending his school. he samples the population by dividing the students into groups by grade level and randomly selecting a proportionate number of students from each group. he then collects data from the sample. which type of sampling is used? select the correct answer below: systematic sampling convenience sampling stratified sampling cluster sampling