Final answer:
To find 'Apex Code', you should look in the Metadata Grid of the Salesforce platform. Apex Code is a programming language used for back-end development within the Salesforce ecosystem.
Step-by-step explanation:
In the context of the Salesforce platform, the term Apex Code is usually found in the Metadata Grid. Thus, to find "Apex Code", you would look in option a. Metadata Grid. Apex Code is a strongly typed, object-oriented programming language that allows developers to execute flow and transaction control statements on the Salesforce servers in conjunction with calls to the API.