What type of data is likely to be found in the header of a PNG file?

The header of a PNG (Portable Network Graphics) file primarily contains image metadata, which includes essential information about the image. This metadata can consist of the dimensions of the image, the color type, the bit depth, and compression details. The header ensures that software interpreting the PNG file can correctly display the image and process its data.

Image metadata is vital for understanding how to accurately interpret the content of the file. Other forms of data mentioned in the other choices, such as document references, executable scripts, or raw binary data, do not pertain to the typical structure or purpose of a PNG file header. Document references might be found in different types of file formats, while executable scripts are related to programming files, and raw binary data is a generic term that does not specifically relate to the structured and organized metadata found within a PNG header.