In this channel of communication, messages are carried by sound and light waves.
a. teleconference
b. face-to-face
c. voicemail
d. hard copy memos

Which of the following is a way the operating system prevents unknown or unauthorized users from accessing the system?

Need asap write a short paper describing the history and differences between six sigma, waterfall, agile, and scrum models. understanding these models can give you a good idea of how diverse and interesting it development projects can be. describe what the rationale for them is and describe their key features. describe the history behind their development. at least 400 words

Which one of the following is the most accurate definition of technology? a electronic tools that improve functionality b electronic tools that provide entertainment or practical value c any type of tool that serves a practical function d any type of tool that enhances communication