To answer this question, you need to understand the concept of metadata extensions. Let's go through each option to understand why it is correct or incorrect:
Option A) It extends the metadata stored in the repository by associating a repository object - This option is correct. Metadata extensions can be used to extend the metadata stored in a repository by associating it with a repository object.
Option B) Vendor defined and User Defined are two types of Metadata Extensions - This option is correct. Vendor defined and User Defined are two types of metadata extensions that can be used to define additional metadata properties.
Option C) It is mandatory to specify metadata extensions for every transformation - This option is incorrect. It is not mandatory to specify metadata extensions for every transformation. Metadata extensions are optional and can be used to define additional metadata properties as needed.
Option D) A new port can be added to the source by using metadata extensions - This option is correct. Metadata extensions can be used to add new ports to a source object.
The correct answer is C) It is mandatory to specify metadata extensions for every transformation. This option is incorrect because metadata extensions are optional and not mandatory for every transformation.