(a). Suppose you are going to transmit a packet over OSI Network Model. Explain the working of Router, Gateway and Switch. Which device will be used if you face an issue of weak signals during transmission? Also, Mention on which level of OSI model these devices will work efficiently. (b). Attenuation, Distortion and Noise are the causes of Transmission impairment. What would be the solution or how these causes can be improved.

Jason is working on a microsoft excel worksheet and he wants to create a print preview shortcut. his teacher asks him to access the customization option to create the new shortcut. which two tabs should jason select to place the print preview shortcut on the worksheet toolbar? a. new tab (custom) and new group (custom) b. new file tab (custom) and new tab (custom) c. new custom group and new command d. new custom tab and new command