Final answer:
To maintain a transparent background for a graphic on a web page, choose File > Save for web, then PNG32.
Step-by-step explanation:
To maintain a transparent background using a matte color for a graphic on a web page, and since the visibility of the background layer is turned off, the best option to save the graphic would be to choose option 3) File > Save for web, then PNG32.
PNG32 is a file format that supports transparency, and it can maintain the transparent background while also preserving the quality of the image. This format is widely used for web graphics, especially when transparency is required.
To maintain a transparent background with a matte color, and given that the background layer visibility is turned off, you should choose:
File > Save for Web, then PNG32
PNG32 supports 8 bits per channel, including an alpha channel for transparency, making it suitable for images with transparent backgrounds. This option allows you to save the graphic with a transparent background and a matte color if needed.