World's first Bank-Agnostic Instant Funds Transfer Platform using Facebook was launched by?
Step 1: Kotak Mahindra Bank launched "KayPay", the world's first bank-agnostic instant funds transfer platform using Facebook.
Step 2: It allowed users to transfer money securely to friends on Facebook regardless of their bank. \[ \boxed{\text{Kotak Mahindra Bank}} \]
Check each bank named in the options against the description of a Facebook-based, bank-agnostic instant transfer platform.
Only Kotak Mahindra Bank's KayPay fits the "bank-agnostic instant funds transfer using Facebook" description.
So, the correct answer is Kotak Mahindra Bank.