Call Section action can be used to make a call to -
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only a local section
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both to a local section or an external section
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both to a local section or an external section provided the access property of external section is set to Private
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both to a local section or an external section provided the access property of external section is set to Public
Call Section action can invoke both local sections (within the same Application Engine program) and external sections (from other programs). However, for external sections to be callable, their Access property must be set to Public. Private external sections cannot be called from other programs - this is a security and encapsulation feature. Local sections have no access restriction since they're part of the same program.
A Call Section action can invoke a section in the same program (local) or a section defined in a different Application Engine program (external), but an external section can only be called if its Access property is set to Public — Private sections are restricted to being called only from within their own program. This access-control rule is what distinguishes the correct option from the ones claiming unrestricted or Private-only external calls.