Which among the following is used in recombinant DNA technology ?

All of these .

a-Ethidium bromide .

b-Plasmid vector .

c-Restriction endonuclease .

d-All of these is the correct option.

All of the options mentioned (Ethidium bromide, Plasmid vector, and Restriction endonuclease) are used in recombinant DNA technology. Ethidium bromide is used to stain DNA in agarose gels for visualization, plasmid vectors are used to carry and replicate the recombinant DNA, and restriction endonucleases are used to cut DNA at specific recognition sites during the cloning process.