1. Which of the following commands will accept extended regular expression as argument? (can be more than one a. grep -E argument b. egrep -w argument c. fgrep -c argument d. grep argument 2. How will you use the extended regular expression { } with basic regular expressions? a. {\ }\ b. \{ \} c. \\{ \\} d. {\\ }\\ 3. The command patterns grep w cat and grep \ are equivalent. True or False 4. The metacharacters ( ) are used to treat a group of characters as a single unit. True or False