This statement is false because a subflow cannot access all variables in the calling script, unless they are passed as input parameters or global variables. A subflow has its own local variables that are not visible to the calling script. A subflow can only access the variables that are mapped to its input parameters or declared as global variables1.

The other statements are true because:

B. When the Call Subflow step executes, you can transfer values of variables from the calling flow to the subflow. This statement is true because you can use the Input Mappingstab of the Call Subflow step to map the variables from the calling flow to the input parameters of the subflow. This allows you to pass data to the subflow and initialize its variables2.

C. After the Call Subflow step executes, you can transfer values of variables from the subflow to the calling flow. This statement is true because you can use the Output Mappings tab of the Call Subflow step to map the variables from the subflow to the variables of the calling flow. This allows you to return data from the subflow and update the variables of the calling flow3.

D. The same subflow can be invoked from different scripts. This statement is true because a subflow is an independent script that can be reused in other scripts. You can call the same subflow from different scripts using the Call Subflow step and specify the subflow name and location4.

References: 1: Troubleshoot the Subflow - CRS Script - Cisco 2: Cisco Unified Contact Center Express Editor Step Reference Guide, Release 12.5(1) - Chapter 1: General Steps [Cisco Unified Contact Center Express] - Cisco 3: Cisco Unified Contact Center Express Editor Step Reference Guide, Release 12.5(1) - Chapter 1: General Steps [Cisco Unified Contact Center Express] - Cisco 4: Cisco Unified Contact Center Express Editor Step Reference Guide, Release 12.5(1) - Chapter 1: General Steps [Cisco Unified Contact Center Express] - Cisco