Two part circular linked chain implementation of a queue
a. all other answers
b. keep nodes that are deallocated for future use
c. allocates newnode on demand when there are no available nodes
d. is intialized with ni available nodes

What is estimated time of arrival (eta)? a device that measures the acceleration (the rate of change of velocity) of an item and is used to track truck speeds or taxi cab speeds a gps technology adventure game that posts the longitude and latitude location for an item on the internet for users to find a north/south measurement of position the time of day of an expected arrival at a certain destination and is typically used for navigation applications