Assume you request a webpage consisting of one document and five images. The document size is 1 kbyte, all images have the same size of 50 kbytes, the download rate is 1 Mbps, and the RTT is 100 ms. How long does it take to obtain the whole webpage under the following conditions? (Assume no DNS name query is needed and the impack of the request line and the headers in the HTTP messages is negligible) a. Nonpersistent HTTP with serial connections. b. Nonpersistent HTTP with two parallel connections. C. Nonpersistent HTTP with six parallel connections. d. Persistent HTTP with one connection