In what situation is a read receipt notification not sent when an email is opened or previewed by a recipient? O when the recipient selects to disallow the sending of the receipt
O when the recipient has previewed but has not opened a message
O when the recipient reads and then permanently deletes the message
O when the recipient uses the Reading pane to open the message

Given int variables k and total that have already been declared, use a while loop to compute the sum of the squares of the first 50 counting numbers, and store this value in total. thus your code should put 11 + 22 + 33 + + 4949 + 50*50 into total. use no variables other than k and total.

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service

Answer these and get 40 points and brainliest