The DataWeave Core (dw::Core) module contains the most frequently used functions and operators for data transformation. To streamline development, all functions and modules within dw::Core are automatically imported and available for use in any DataWeave script. This eliminates the need for an explicit import statement for fundamental operations on strings, numbers, arrays, and objects, making scripts more concise.

B. dw::System provides access to system properties and environment variables and must be explicitly imported before use.

C. dw::Runtime provides information about the Mule runtime environment and requires an explicit import to be used.

D. dw::Crypto contains cryptographic functions and must be explicitly imported to ensure clarity and security in the script.

1. MuleSoft Documentation, "DataWeave Core Functions (dw::Core)". States: "All the functions and modules in the Core (dw::Core) module are imported automatically into your DataWeave scripts."

2. MuleSoft Documentation, "DataWeave Modules". This page lists various modules, implicitly showing that modules other than Core require an import statement. For example, the dw::Crypto section shows the required import syntax.