A '.pdf' extension stands for:
APicture Document Format
BPersonal Data File
CPrint Doc Format
DPortable Document Format
Answer & Solution
Correct answer: D. Portable Document Format
1. PDF was created by Adobe in 1993.
2. Full form: Portable Document Format.
3. Hence option B.
_Source: UGC NET Paper 1 Study Book (ugc-net.com class notes) — File Formats_