Final answer:
The correct answer is to create an environment variable named Org_URL in the development environment, specify unique names for each configuration within the release cycle.
Step-by-step explanation:
The question refers to setting up an environment variable in software deployment scenarios. Here we are looking to fill in the blanks with the correct option for where to create an environment variable named Org_URL, and how to specify its value for each instance in a particular phase. The correct answer is:
You can create an environment variable in the development environment, and name it Org_URL. You have also specified the unique names for each configuration in the release cycle.
Option C is the most appropriate as it fits the context of setting environment variables during different stages of software development. In development environments, unique names are important for identifying specific configurations that are part of a broader release cycle.