Which option is used with grep command for ignoring the case in pattern searching?

Which option is used with grep command for ignoring the case in pattern searching? Correct Answer -i

When we want to search a pattern using grep command and we want to ignore the case or we are not sure of the case, we’ve to use the -i option. This option ignores the case the pattern matching. $ grep -i ‘agarwal’ emp.lst 3564| sudhir Agarwal | executive |personal | 06/07/47 |7500