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(B) In $1928$,Frederick Griffith performed a series of experiments with $Streptococcus$ $pneumoniae$ (the bacterium responsible for pneumonia).He used

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$2$

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(B) In $1928$,Frederick Griffith performed a series of experiments with $Streptococcus$ $pneumoniae$ (the bacterium responsible for pneumonia).He used two strains of this bacterium:$1$. $S$-strain (Smooth): These bacteria have a polysaccharide coat (mucous) and are virulent (cause disease).$2$. $R$-strain (Rough): These bacteria lack the polysaccharide coat and are non-virulent (do not cause disease).Therefore,a total of $2$ strains were used in his experiment.

How many strains of bacteria were used in Griffith's experiment?

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