What does the + symbol mean in the following grep regular expression:
grep ‘^d[aei]\+d$’ /usr/share/dict/words
A.
Match the preceding character set ([aei]) one or more times.
B.
Match the preceding character set ([aei]) zero or more times.
C.
Match the preceding character set ([aei]) zero or one times.
D.
Match a literal + symbol.
Explanation:
The answer should be “Match a literal + symbol” because there is a backslash symbol before the
plus, so it should match a literal +.