These three approvals are often quoted together as if they're one signal — they're not. Each certifies something different, and a program can hold one without the others.
UGC-DEB entitlement: the one that matters most for validity
This is the specific government approval that makes an online degree valid for that program, at that university, for that academic year. It's checked against a published list, not just claimed.
NAAC: institutional quality, not per-program
NAAC grades the university as a whole, not any specific program. It's a real quality signal, but it doesn't substitute for program-specific UGC-DEB entitlement — and large universities can have multiple separately-graded legal entities, so the grade you see quoted may not be the exact entity granting your specific degree.
AICTE: only relevant to certain technical/management programs
AICTE approval matters for programs like MBA and MCA. It's not relevant to categories like BCA or BBA, which aren't AICTE-regulated at all — so don't expect (or require) it there.