Final answer:
The plugin required to activate contract rate cards features is 'Contract Management.' This feature helps organizations manage and oversee contract-specific rates, terms, and conditions within a software platform.
Step-by-step explanation:
To utilize the contract rate cards features, the required plugin to be activated is B. Contract Management. Contract rate cards are often used by organizations within software platforms for managing various aspects of contracts, including pricing, terms, and conditions specific to particular contracts or service agreements. By enabling this feature through the Contract Management plugin, businesses can effectively oversee and manage contract rates efficiently, ensuring they are in alignment with negotiated agreements and financial objectives.