4. You are given the following commercial automobile policy experience: Company Year 1 Year 2 Year 3 Total losses Auto $5,000 $5,000 Number of Automobiles 10 20 10 Prior distribution of the mean loss per automobile is exponential with mean $400; the loss distribution (severity) is exponential with mean @ (it means that only automobiles with non-zero losses are included in the count). Determine the Buhlmann-Straub credibility estimate of the total loss for Company Auto in Year 3. Indicate the nearest option: A. $340 B. $380 C. $3,300 D. $3,380 E. $3,500 (*) Calculate structural parameters and credibility factor: V = a = Z =