________ was launched in 2001 as the first true social bookmarking service

A client attempts to connect to a network resource and is given an error message about their access being restricted. Which of the following BEST describes the reason for denial?

A. The user's account failed to authenticate with correct permissions. B. The user's account is disabled. C. The network resource is unavailable. D. The user is not connected to the network

The Atanasoff-Berry Computer was the first computing device to use ________ instead of mechanical switches as processing circuitry.

Fill in the blank(s) with the appropriate word(s).