The market research firm employed by eHarmony to assist in better understanding the French$-$Canadian market needs to create a sample plan to be approved by eHarmony management. To create the sample plan they needed the answer to which two key questions?

a$.$ what is the size of the sample and when does the research need to be presented to management

b$.$ what is the population to be surveyed and should the sample be representative

c$.$ what is the size of the sample and what is the cost to conduct the research

d$.$ who will complete the surveys and how will the final report be written