Solution

The correct answer is option 4.

Key Points

• If a binary relation R over a set X relates every element of X to itself, it is said to be reflexive. Since (c,c) and (d,d) is not given in the given question, it is not reflexive.
• A binary relation is antisymmetric if there is no pair of distinct elements of X each of which is related by R to the other. The given relation R is antisymmetric because for (c,d) (d,c) is not present in R. Similarly for (c,g) and (d,g).
• A binary relation is a type of binary relation. An example is the relation "is equal to", because if a=b is true then b=a is also true. Here since (c,d) is pair in a given relation R for which (d,c) is not present in it. So. it violates the Symmetric property of the relation. Hence it is not symmetric.

 ∴ Hence the correct answer is B and not-A.