Which of the following checks if the sixth character of a string variable named myMail is the @ sign using a Boolean variable named atSign set to true if this is true?
a.
```
for (k = 0; k < myMail.length; k++)
{
if(myMail.charAt(k) == @)
atSign = true;
}
```
b.
```
atSign = "@";
for (k = 0; k < 7; k++)
{
if(myMail.charAt(k) == atSign)
flag = true;
}
```
c.
```
if(myMail.substr(5, 1) == "@")
```
d.
```
if(myMail.substr(1, 5) == "@")
atSign = true;
```
c.
```
if(myMail.substr(5, 1) == "@")
```
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