Determine whether the relation R on the set of all Web
pages is reflexive, Irreflexive, symmetric, antisymmetric, and/or transitive,
where (a, b) ∈ R if and only if
a) everyone who has visitedWeb page a has also visited
Web page b.
b) there are no common links found on both Web
page a andWeb page b.
c) there is at least one common link onWeb page a and
Web page b.
d) there is a Web page that includes links to both Web
page a andWeb page b.
Why option a is not symmetric but reflexive? why option c and d is not reflexive?
Please explain it with clear example. Thank you.