Which of the following is a limitation of the default PDF profile?

The default PDF profile has the specific limitation that it is only available if no other PDF profiles are created in the workspace. This means that once you create a custom PDF profile in the workspace, the default profile becomes unavailable. This limitation can impact the flexibility of users who may want to utilize the default settings provided by the default profile in conjunction with other custom settings they create.

The other choices detail features or capabilities that are not limitations: modifying the profile, creating searchable PDFs, and allowing users to add redactions and slip sheets do not restrict the usability of the default profile directly but rather describe functionalities that are available within the scope of its operation. Understanding this limitation helps users to effectively manage their PDF profiles and adapt their workspace according to their project needs.