Metadata is attached to each Excel workbook

Your company has recently adopted several new account policies that will be enforced for all user accounts. One of the policies is an account lockout policy. What is the purpose of this policy?

A. It configures the number of unique new passwords that must be associated with a user account before an old password can be reused. B. It configures the maximum number of days a password can be used before the user must change it. C. It ensures that an account can no longer be used after a certain number of unsuccessful login attempts. D. It configures the fewest number of characters that can make up a password for a user account.

A client makes RMIs to a server. The client takes 5 ms to compute the arguments for each request, and the server takes 10ms to process each request. The local OS processing time for each send or receive operation is 0.5 ms, and the network time to transmit each request or reply message is 3 ms. Marshalling or unmarshalling takes 0.5 ms per message.

Estimate the time taken by the client to generate and return from 2 requests (i) if it is single-threaded, and (ii) if it has two threads which can make requests concurrently on a single processor. Is there a need for asynchronous RMI if processes are multi-threaded?