Read the case study at: Roland fined 4 million for illegally preventing online price discounts - Case study - (https://www.gov.uk/government/case-studies/competition-law-case-studies)

(a) Brief summary of the case. (b) What was the key evidence against the cartel members? Where did the evidence come from and how strong was the evidence? (c) Did any cartel member apply for leniency?

(Please include detailed explanation)