Implementing customer relationship management (CRM) will enable a company to consolidate and integrate customer data. CRM is a software system that allows a company to collect, store, and manage all its customers' data in one place1. This data can include personal information, contact details, purchase history, preferences, feedback, and more. By consolidating and integrating customer data, a company can gain a holistic view of each customer, understand their needs and behavior, personalize their communication and offers, and improve their satisfaction and loyalty23. The other options are not as accurate or comprehensive as the correct answer. While CRM can also provide a customer portal for ordering, offer a standardized sales approach to all customers, and give salespeople access to real-time order information, these are not the main or only benefits of CRM. They are more specific features or outcomes of CRM, but they do not capture the essence of what CRM does for a company. CRM is more than just a tool for ordering, selling, or tracking orders; it is a strategy for managing and enhancing customer relationships23.

E-commerce enabled supply chains are designed to fulfill individual consumer orders, which are typically smaller in size compared to traditional bulk shipments to retailers. The nature of e-commerce requires efficient handling, packaging, and shipping of numerous small packages directly to customers' addresses. This makes parcel shipments a key characteristic of e-commerce supply chains. These parcel shipments are often managed through sophisticated logistics networks that can handle high volumes of small packages and provide quick delivery times.
* Push system (A) is more associated with traditional retail supply chains where products are pushed to stores based on anticipated demand.
* Small number of niche customers (C) is not typically associated with e-commerce, which often aims for a broader market.
* Fewer reverse logistics activities (D) is not accurate as e-commerce tends to have a higher rate of returns and requires robust reverse logistics capabilities.
References
* Chopra, S., & Meindl, P. (2016). Supply Chain Management: Strategy, Planning, and Operation.
Pearson.
* Christopher, M. (2016). Logistics & Supply Chain Management. Pearson.

Sell-side e-commerce refers to online platforms where businesses sell products directly to consumers.
Automated order entry and tracking are essential components of this process as they streamline the purchasing experience, ensuring orders are accurately captured and customers can monitor the status of their purchases.
While automated returns processing, advance ship notice (ASN), and electronic data interchange (EDI) are important, they are not as universally mandatory for the basic functionality of sell-side e-commerce as automated order entry and tracking.
:
Laudon, K. C., & Traver, C. G. (2021). E-commerce 2021: Business, Technology, Society.
https://www.supplychaindive.com