Answer : 3. "Exchange of money"
Explanation :

The mobile wallet can be used for the following functions:

1. Payment: Using a mobile wallet, you can make payments both online and offline. You can pay using your mobile wallet at any store, restaurant, or other business that accepts mobile wallets.

2. Money Transfer: Using a mobile wallet, you can transfer funds from your bank account to another person's bank account. You can send money to your friends, family, or any other person using a mobile wallet.

3. Recharge and bill payments: Using a mobile wallet, you can pay your mobile phone, data pack, electricity bill, water bill, and other bills.

4. Point of Sale (POS) Transactions: Using mobile wallets, you can make payments through POS machines. For POS transactions, you simply need to open your mobile wallet app and tap your phone on the POS machine to make a payment.