Which of the following statements about adts are true?
a. they specify the values the data type can hold.
b. they specify the operations the data type can perform.
c. they hide the details of how the data type is implemented.
d. they do all of these.

1. which of the following statements are true about routers and routing on the internet. choose two answers. a. protocols ensure that a single path between two computers is established before sending packets over it. b. routers are hierarchical and the "root" router is responsible for communicating to sub-routers the best paths for them to route internet traffic. c. a packet traveling between two computers on the internet may be rerouted many times along the way or even lost or "dropped". d. routers act independently and route packets as they see fit.