The correct answer is D. all of the mentioned.
Salesforce.com, Amazon.com, and Flipkart.com are all SaaS platforms that expose APIs. An API, or Application Programming Interface, is a set of rules that allow two pieces of software to communicate with each other. APIs are used to allow developers to build new applications on top of existing platforms.
Salesforce.com is a cloud-based customer relationship management (CRM) platform. It allows businesses to manage their customer data, track sales leads, and automate marketing campaigns. Salesforce.com exposes a number of APIs that allow developers to build custom applications that integrate with Salesforce.com.
Amazon.com is an online retailer that sells a wide variety of products. Amazon.com exposes a number of APIs that allow developers to build applications that integrate with Amazon.com. For example, the Amazon Product Advertising API allows developers to display Amazon products on their own websites.
Flipkart.com is an Indian e-commerce company that sells a wide variety of products. Flipkart.com exposes a number of APIs that allow developers to build applications that integrate with Flipkart.com. For example, the Flipkart Seller API allows developers to build applications that help sellers manage their inventory and orders on Flipkart.com.
In conclusion, all of the mentioned SaaS platforms expose APIs. APIs allow developers to build new applications on top of existing platforms.