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nism-series-xa-ckycr-14-digit-kyc-identification-number[ INVESTMENT ADVISER (LEVEL 1) ]

What is the 'Central KYC Registry' (CKYCR) 14-digit 'KYC Identification Number' (KIN)?

[ A ]A 14-digit credit card number issued by commercial banks for online retail shopping.
[ B ]A secret password used to access stock exchange trading servers.
[ C ]A unique 14-digit identifier issued by CERSAI upon centralized verification of an investor's KYC records, enabling uniform interoperable KYC across all financial regulators (SEBI, RBI, IRDAI, PFRDA).[ CORRECT ]
[ D ]An income tax refund tracking number issued by the Central Board of Direct Taxes.
Takeaway

The CKYCR's 14-digit KIN is a unique identifier issued by CERSAI after centralized verification of an investor's KYC records, enabling that single verified KYC to be reused seamlessly across SEBI, RBI, IRDAI, and PFRDA-regulated entities.

Derivation
Before CKYCR, investors had to repeat full KYC documentation separately for each mutual fund, broker, bank, or insurer they dealt with. CERSAI (Central Registry of Securitisation Asset Reconstruction and Security Interest of India) now operates the Central KYC Registry: once an investor's KYC is verified and uploaded by any regulated intermediary, CERSAI issues a 14-digit KIN, and any other regulated entity across financial sectors can simply pull that verified record using the KIN instead of re-collecting documents. This interoperability across regulators (not just within securities markets) is the specific detail the exam is testing, since candidates sometimes assume KIN is a SEBI-only construct rather than a cross-sector financial system utility.
Why the others fail
A — A 14-digit credit card number issued by commercial banks for online retail shopping.
A KIN is a KYC verification identifier tied to an investor's identity records, entirely unrelated to credit card numbers used for retail payment transactions.
B — A secret password used to access stock exchange trading servers.
A KIN identifies a verified investor record for regulatory interoperability — it is not a secret authentication credential used to log into trading servers.
D — An income tax refund tracking number issued by the Central Board of Direct Taxes.
Income tax refund tracking uses a separate acknowledgment/reference number issued through the income tax e-filing portal, unconnected to the CERSAI-administered KYC registry.