Which element of an ICMP header would indicate that the packet is an ICMP echo request message.

The style rule* {color: blue;}uses the asterisk (*) selector-also known as the ______ selector-to select all elementsin the document.

A. character B. text C. wildcard D. object

At 50% opacity, an object's color is always lighter.

Answer the following statement true (T) or false (F)