What are the two main reasons to build in the Global scope?

Building in the Global scope within ServiceNow provides distinct advantages, particularly related to access and functionality. One of the primary reasons is the access to APIs and global application files, which are essential for leveraging the full capabilities of the platform. This means that developers can utilize a wider array of built-in functionalities and services that are not limited to a specific scoped application, thus enhancing the overall integration and utility of the application.

Additionally, when operating in the Global scope, developers can tap into non-scoped functionalities that may be necessary for broader application behaviors or for applications that need to interact across different scopes. This flexibility is crucial, especially in environments where multiple applications need to work together or share data seamlessly.

While the other options touch on important aspects such as performance, security, and collaboration, they do not encapsulate the specific advantages of API access and the ability to use non-scoped functionalities as comprehensively as the correct choice does. Hence, understanding the scope you are developing in, especially in a complex environment like ServiceNow, helps in creating applications that are efficient and capable of leveraging the platform's full range of features.