A disadvantage is that it does not include formatting such as bold, columns and graphics.
Given two files with the same text, a TXT file usually requires more disk space.
Given two files with the same text, an RTF file usually requires more disk space.
Both are types of text format and both provide the same formatting.
None of these
Save as a BMP
They always produce larger files than BMPs and provide more colours.
They are best suited for photographs.
They are unsuitable for storing photographs and offer a more limited range of colours compared to BMP and JPG.
They offer 512 possible colours.
The number of bits used to represent a colour in a pixel
The size or resolution of an image
How much the image has been compressed
Here's an interesting quiz for you.