Alice Zhong is the VP of operations at Pearl Financial Services. She wants to measure customer satisfaction after a new website and other changes were introduced a few months ago. For this purpose, she uses random five-digits numbers from the website random. org (which offers true random numbers on the Internet). This is an example of .a. disproportionate systematic sampleb. disproportionate stratified samplec. proportionate stratified sampled. proportionate systematic samplee. proportionate cluster sampling