The correct answer is A. Save Button.
The Save button is used to save the current solution to the current file. The Save As button is used to save the current solution to a new file. The Save Solution button is used to save the current solution to the current file and close the solution. The Save All button is used to save all open solutions to their current files.
The Save button is typically located in the toolbar at the top of the window. It is a small button with a disk icon. When you click the Save button, the current solution is saved to the current file. If the file has not been saved before, a dialog box will appear asking you to name the file.
The Save As button is typically located next to the Save button. It is a small button with an arrow pointing down. When you click the Save As button, a dialog box will appear asking you to name the file and choose a location to save it.
The Save Solution button is typically located in the File menu. It is a command that saves the current solution to the current file and closes the solution. If the solution has not been saved before, a dialog box will appear asking you to name the file.
The Save All button is typically located in the File menu. It is a command that saves all open solutions to their current files. If any of the solutions have not been saved before, a dialog box will appear asking you to name the files.