Why is the Internet Protocol connectionless and unreliable? [check all answers that you think apply] IP is connectionless so that we don't get charged per unit time for voice over IP phone calls The networking layer is responsible for best effort end to end delivery - reliability can be implemented at higher layers if required It is more sensible to implement a "bare-bones" delivery mechanism at the networking layer to maximise efficiency It is easier to implement an unreliable protocol than a reliable one It is much better to use a connectionless protocol than a connection-oriented one for security reasons It is possible to implement a connection-oriented protocol on top of a connectionless protocol, but doing the converse would not make any sense