Consider the following use case for for a credit reporting agency (cra): 1. a customer applies for a new mortgage with a bank. 2. the bank sends a query to the cra asking for the customer's credit rating 3. the cra records the fact that a credit inquiry was made regarding that customer in the customer's credit history, stored at the cra. 4. if more than k (a secret constant that varies from one cra to another) credit inquiries have been made about that customer within a month, the customer's rating is decreased, with the new value recorded in the credit history. 5. the cra sends the customer's credit rating (from the customer's credit history) to the bank. 6. the bank informs the customer of his credit rating. assume, for the sake of discussion, that the step numbers denote time (e. g,, the query is sent at time t-2 seconds). which of the following statements are likely to be true for a sequence diagram portraying this use case? there is an activation box on the bank timeline from time t-2 to time t-6 there is a solid arrow labelled "recordlnquiry" at time t-3 from the cra timeline to the customer timeline. there is an anchor or an opt frame near the middle of the time lines. there is a solid arrow labelled "sendcreditrating(rating)" at time t-5 from the cra timeline to the bank timeline. there is a solid arrow labelled "requestcreditrating(customer)" at time t 2 from the bank timeline to the cra timeline. there is an activation box on the cra timeline from time t-2 to time t-5