A. National Payments Corporation of India (NPCI)
B. Academic Bank of Credits (ABC)
C. Unique Identification Authority of India (UIDAI)
D. National Scholarship Portal

Solution

B. Academic Bank of Credits (ABC)

Explanation

The APAAR ID is a unique, permanent 12-digit ID assigned to each student, serving as a lifelong academic passport, consolidating all achievements and credentials in one place. 

The ABC system, or Academic Bank of Credits, is a digital repository where students can store and access their academic credits, and it is linked to the APAAR ID.