What is stability plasticity dilemma ?

• A. system can neither be stable nor plastic
• B. static inputs & categorization can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be handled
• C. dynamic inputs & categorization can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be handled
• D. none of the mentioned