Stratified sampling technique is unrestricted probability(random) sampling techinque. why is this statement incorrect?

dear student this statement is incorrect because stratified sampling technique is simple probability sampling technique not unrestricted probability sampling technique.

simple random without replacement sample, a frame record may appear in the simple only once. With unrestricted random samples a record may appear in the sample multiple times.

dear student this statement is incorrect because stratified sampling technique is simple probability sampling technique not unrestricted probability sampling technique.