Explanation:

This question is ambiguously phrased with 'Remedy'. If it refers to *characteristics* or *problems* of first-generation computers, then (b) 'Large size' is a correct characteristic and a significant problem. First-generation computers, using vacuum tubes, were indeed enormous. However, (c) 'No heat generatio' (likely a typo for 'No heat generation') is factually incorrect. First-generation computers were notorious for generating immense amounts of heat due to the vacuum tubes, requiring extensive cooling systems. Therefore, if (d) 'B and C both' is the intended correct answer, it implies a factual error in option (c). A more accurate option (c) if it were a problem would be 'High heat generation'. Given the options as written, (b) is a true characteristic, but (c) is false, making (d) logically inconsistent. However, if we must select the marked answer (d), it highlights a flaw in the question's options, where (b) is a valid characteristic but (c) is factually wrong for first-generation computers.