Question: String sentence; String str1, str2, str3, str4; int length1; sentence = First test is on Monday.; str1 = sentence.substring(6, 12); str2 = str1.substring(0, 4); str3

String sentence; String str1, str2, str3, str4; int length1; sentence = "First test is on Monday."; str1 = sentence.substring(6, 12); str2 = str1.substring(0, 4); str3 = sentence.replace('i', '#'); str4 = sentence.indexOf("on"); length1 = sentence.length(); Based on the code above, what is the value of str4?

options:

11

12

13

14

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