What is the result?

Given the code fragment:
String str = “Java is a programming language”;
ToIntFunction<String> indexVal = str: : indexOf; //line n1
int x = indexVal.applyAsInt(“Java”); //line n2
System.out.println(x);
What is the result?
A. 0
B. 1
C. A compilation error occurs at line n1.
D. A compilation error occurs at line n2.

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