IN THIS ANSWER(A) IS GIVEN TO BE CORRECT IN ANSWER KEY BUT I WAS GO FOR OPTION (3) PLEASE GIVE YOUR SUGGESTION WHICH WAS CORRECT

34.    For DNA probes to hybridize

(a)   DNA Strands must be homologous. having regions with similar or identical nucleotide sequences 
(b)   DNA strands must be non-homologous 
(c)   DNA must be complementary to RNA
(d)   DNA must be fragmented by reverse ​transcriptase

Dear Student,

Option (a) is the correct answer.

DNA probe is a segment of DNA. The sequence of nucleotide bases of this probe is known. Then, this probe is used to detect a complementary sequence in the sample DNA by means of complementary base pairing.
In DNA hybridisation, single strands of DNA from two different sources (either two plant or two animal species) are allowed to anneal together to form a hybrid double-stranded DNA. These complementary strands are bonded together by hydrogen bonds. To form complementary base pairs, the DNA strand must have regions with similar or identical nucleotide sequences.

In DNA-RNA hybridisation, one strand is DNA and the other strand is the complementary RNA. Here, DNA must be complementary to RNA so that when hybridisation occurs, the RNA strand must displace the other DNA strand and then both strands anneal together and form a DNA-RNA hybrid.


Regards

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Option 1 is correct as it takes into account the formation of a bond between Adenine and Thymine, Guanine and Cytosine. This is the sequence which is being referred to.  
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