In Avaloq ICE, extending functionalities involves which of the following actions?

In Avaloq ICE, extending functionalities primarily revolves around implementing custom scripts and business objects. This approach allows organizations to tailor the software according to their specific business requirements, enhancing the system's capabilities beyond the standard offerings. By integrating custom scripts, users can automate processes, create new functionalities, and modify existing features, thereby aligning the software more closely with operational needs. Moreover, introducing custom business objects enables the modeling of unique data requirements, allowing for better data management and functionality that fits the institution's business model.

The other options do not directly contribute to extending functionality in the same impactful way. Rebranding the software interface refers more to the visual presentation and user experience rather than enhancing or expanding what the system can do. Updating operational manuals involves documentation processes but does not necessitate any change in system capability. Relying solely on out-of-the-box features implies using the software as is, without modifications or enhancements, which does not fulfill the goal of extending functionalities.