15. The third calculation Alex wants to make is to determine the total payments for the policy type of the client he is looking up, which now appears in cell J6. Calculate the total payments for a policy type as follows: a. In cell K7, begin to enter a formula using the DSUM function. b. Use structured references to the [#Headers] and [#Data] in the Clients table to specify the formula database. c. Use a structured reference to the Payment field header to specify the field to summarize. d. Use the values in the range J5:J6 as the criteria