What does the following C# code set specify?

[answerhappygod]

public static int Compare(string strA, int indexA, string strB, int indexB, int length, bool ignoreCase)
a) Comparison begins at strA[indexA] and strB[indexB] and runs for length of characters
b) Returns output > 0 for for strA > strB else < 0 for strA < strB else if strA = str B output is 0
c) Comparison is culture sensitive and if ignore case is true, comparison ignores case differences
d) All of the mentioned