Which function call returns 0?

The function call that returns 0 is indeed associated with the scenario described. The 'find_any_of' function is designed to search for any occurrence of the specified substring ('sub') within the given string ('val'). If it finds at least one occurrence, it will return the position of the first character of the substring in the string, which is typically a positive integer value.

However, if the substring does not exist at all within the string, the function will return 0. In this specific case with 'val' being 'ABAP ABAP abap' and 'sub' being 'AB', you would expect that the function finds an occurrence of 'AB' and returns its position. If, however, due to some condition the function does not find it (for example, if the case sensitivity was a factor not applicable here), it would return 0.

This option correctly aligns with the expected behavior of the 'find_any_of' function when it fails to locate the specified substring in the input string. The other functions, such as 'Count_any_of' and 'Count', will provide counts of how many times the substring appears, while 'find_any_not_of' serves a different purpose of locating characters not present within the string and thus