What does the principle of ‘data minimization’ mean?

What does the principle of ‘data minimization’ mean?
A . Personal data shall be accurate and where necessary kept up to date.
B . Personal data shall be adequate and limited to what is necessary for the purposes of the processing.
C . Personal data shall be processed in a manner that ensures appropriate security of the personal data.
D . Personal data shall be processed lawfully, fairly and in a transparent manner in relation to the data subject.

Answer: B