Answer the question within 40 min please

Question 2. A&B plc. is a reputable consultancy company which undertakes a range of research work in the UK. A high street bank offered 100,000 to A&B ple to undertake research regarding their customers' satisfaction on provision of services in the Central London. There are about 1.5 million customers in the region. Due to financial, logistics and time constraints, A&B consultancy firm is unable to take survey all its customers. a) Using appropriate examples, explain the difference between probability sampling and non-probability sampling. [5 Marks] b) You are required to identify and explain any 5 sampling methods that could be used for this study. [10 Marks] c) Explain the advantages and disadvantages of the sampling techniques identified in part (b) [15 Marks]