Which two statements are true about the Block Data Visibility Data Pattern? (Choose two.)

Which two statements are true about the Block Data Visibility Data Pattern? (Choose two.)
A . It is able to define data elements, which are accessible by each of the components of the corresponding sub- process.
B . It can be defined by tasks, which are accessible only within the context of individual execution instances of u that task.
C . It is specific to a process instance or case. They can be accessed by all components of the process during the execution of the case.
D . It exists in the external operating environment, able to be accessed by components of processes during ^ execution.

Answer: A,C