Cadigal Bank has compiled the following migration matrix on consumer loans. The higher the risk grade the higher the default risk. If in the most recent year, the bank manager finds that the transition probability from risk grade 1 to 3 is 0.05 and to 4 is 0.06, then the bank manager should take which of the following actions to reduce concentration risk? Select one: a. Restrict supply of loans to risk grade 1 borrowers. b. Increase credit risk premium on risk 3 borrowers. c. Restrict supply of loans to risk grade 2 borrowers. d. Increase supply of loans to risk grade 2 borrowers. e. Increase supply of loans to risk grade 3 borrowers