Final answer:
To create a predefined filter, one needs both navigation hierarchy access and access to the relevant folder. Both forms of access are crucial for locating and storing the filter within the system.
Step-by-step explanation:
To make a predefined filter, the access you need is c) Both a and b, which means access to both the navigation hierarchy and the access to folder. The navigation hierarchy allows you to locate the correct placement for the filter based on the system's structure, and access to the folder where the filter will be stored or applied is essential because without it, you cannot create or modify filters within that folder. Therefore, having both forms of access is necessary to successfully create a predefined filter in a system.