Discussion
Which of the following indicates a PNG file signature ?
Answer: C
The PNG signature is 89 50 4E 47.
Every PNG file begins with the eight bytes 89 50 4E 47 0D 0A 1A 0A. After the non-ASCII byte 89, the next three bytes are the ASCII letters P N G. Forensic tools use such signatures (magic numbers) to identify files whatever their extension.
FF D8 FF E0 is the start of a JPEG file in JFIF format. 50 4B 03 04 spells 'PK' and marks a ZIP archive, which also covers DOCX, XLSX, JAR and APK files. So 'None of these' is wrong.
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