Which method is used to obtain somaclones?

In order to obtain virus-free plants through tissue culture, the best method is:

Given below are two statements:
Statement $I$: In suspension culture and callus culture technique,subculturing is necessary.
Statement $II$: Subculturing is needed only in suspension culture technique.
In the light of above statements,select the correct option given below:

Which option represents the correct sequence of events during callus culture?

Define the following terms: $Somatic$ $hybridisation$ and $Totipotency$.

The capacity to generate a whole plant from any cell/explant is called ..........