C because previous sends you back to something before such as a web page, Next does the opposite and I can't remember what Show MarkUp does.
Answer:
To see who reads the file, open “Windows Event Viewer”, and navigate to “Windows Logs” → “Security”. There is a “Filter Current Log” option in the right pane to find the relevant events. If anyone opens the file, event ID 4656 and 4663 will be logged.
You should have the percentage of tip based on the service that you received.
Then you multiply the percentage of tip by the amount of money that you have to pay for what you bought.
