Answer:
I think B. I'm sorry if I'm worng
Guido d'arezzo contributed to the development of musical notation. Option B. This is further explained below.
Who is Guido d'arezzo ?
Generally, Guido d'arezzo aka Guido d'Arezzo, was an Italian High Medieval music theorist and educator who lived from from 991 to 1033.
In conclusion, He was a Benedictine monk who is widely recognized as the creator of the current staff notation, which profoundly impacted the evolution of Western musical notation and practice.
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Answer:
<h3>
The Open Systems Interconnection Model (OSI)</h3>
Explanation:
OSI Model was given birth by the International Organization for Standardization in 1978. It is a conceptual framework that defines the roles of a networking or telecommunication system. The idea is to use layers to visually describe what is happening in a particular networking system. OSI are fragmented further into seven sub components. The model functions in a hierarchy in which each layer has been assigned its own role and once the task is completed it is passed onto the next layer. These seven layers are divided in two main categories known as hot layers and media layers. Hot layer include application, presentation, session and transport layer, whereas media comprises of network layer, data link and physical layer. Today, OSI is so popular that many protocols are developed on its format.
