Which statement will expose the field "connid" from the data source in the entity data definition?

The correct choice indicates how to access the field "connid" from the data source in the context of an entity data definition. In this scenario, underscores often signify an internal structure or a specific context used to refer to the underlying data structure in ABAP CDS views or similar data modeling constructs.

When using the syntax "_spfli.connid," the underscore preceding the name suggests that it is referencing the data source directly, thus clearly indicating that "connid" is a field within the "spfli" structure. This approach is typical in defining fields within a CDS view, where the prefix character helps identify where the field belongs.

Using the other expressions would not correctly align with the expected syntax for accessing fields in a definition, as they may reference entities or structures incorrectly or fail to utilize the appropriate notation that distinguishes between different context scopes in ABAP programming.