Select the correct statement out of the following:

Question

$\begin{array}{1 1} \text{a. A suspension culture consists of a single cell and a small group of cells suspended in a liquid medium.} \\ \text{b. During subculturing, only a part of the culture is transferred into the new media.} \\ \text{c. Sterilization means complete destruction of microorganisms.} \\ \text{d.All of these} \end{array} $