Step 1:
Customer-to-Customer (C2C) e-commerce allows customers to directly buy and sell goods or services among themselves using an online platform.
Step 2:
• Amazon → Business to Customer (B2C)
• OYO → Business service platform
• OLX → Customer to Customer (C2C)
• OLA → Service aggregator
Step 3:
OLX allows individual users to sell products directly to other individuals.
Step 4:
Therefore, the example of C2C e-commerce model is:
\[
\boxed{\text{OLX}}
\]
Hence, the correct answer is:
\[
\boxed{\text{(3) OLX}}
\]