Explanation
The SysML diagram type that is a modification of the UML Class diagram is the Block Definition Diagram (BDD). A BDD shows the definition of blocks in terms of their features, such as properties, operations, ports, etc. It is similar to a UML Class diagram, but it adds some features specific to SysML, such as value types, units, flow properties, etc. A block is an extension of the UML Class metaclass that can be used to model any system component with structure and behavior. References:
https://www.omg.org/ocsmp/ocsmp-adv-exam.htmhttps://sysml.org/tutorials/sysml-diagram-tutorial/