Which component of Avaloq ICE allows developers to modify source codes?

The correct answer is the Editor, as it is the specific component within Avaloq ICE that facilitates developers in modifying and writing source code. The Editor provides a user-friendly interface that allows for coding, syntax highlighting, and other functionalities that help streamline the development process. By using the Editor, developers can easily access the source code, make necessary changes, and implement customizations to meet the requirements of financial services applications.

Contextually, while the other components serve important roles within Avaloq ICE, they do not provide direct functionalities for modifying source code. The Orderbook pertains to the management of transaction orders, the Repository serves as a storage solution for various artifacts but does not directly allow code modification, and the Instance usually refers to a specific deployment or operational environment where applications are executed. These functionalities complement the development process but do not involve the direct editing of source code like the Editor does.