what is the correct output for following code var str idb bisew..., Basic, Javascript

Question:What is the correct output for the following code?var str=”IDB-BISEW ROUND-13”;
alert(str.indexOf(‘E’));

A 6 
B 7 
C 8 
D 9

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Question:What is the correct output for the following code?var str=”IDB-BISEW ROUND-13”; alert(str.indexOf(‘E’));