User Productivity Systems ____

User productivity systems ____.

A) provide job-related information to users at all levels of a company
B) simulate human reasoning by combining a knowledge base and inference rules that determine how the knowledge is applied
C) process data generated by day-to-day business operations
D) include e-mail, voice mail, fax, video and Web conferencing, word processing, automated calendars, database management, spreadsheets, desktop publishing, presentation graphics, company intranets, and high-speed Internet access