Which statement is true about a sample created using stratified random sampling?

a) the first member on the list of names in the population is chosen and every 10th after that, cycling through the whole list.

b) members of the sample are chosen by drawing names from a hat containing the names of all members of the population.

c) names of all people in the population are alphabetized and then chosen by flipping a coin.

d) each member of the sample is chosen at random from two or more groups in the population.