What is the correct string manipulation syntax to extract the first 2 digits of the admin number? string str = "170064B";单项选择题

A

str = str.Substring(1,4);

B

str = str.Substring(0,3);

C

str = str.Substring(0,2);

D

str = str.Substring(1,3);

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What is the output of the following code if the input is: Pasadena Anaheim 2 string str1; string str2; char ch; int index; cin >> str1; cin >> str2; cin >> index; ch = str1[index]; str1[index + 2] = str2[index]; str2[index] = ch; cout << str1 << " " << str2 << endl;  

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