You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image>What are the values of X and Y if X=20 and Y=30 initially and these transactions are executed serially, T1 before T2? (<image 1>)?
A. X=20, Y=30
B. X=50, Y=80
C. X=70, Y=50
D. None of the other answers

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
B
What are the values of X and Y if X=20 and Y=30 initially and these transactions are executed serially, T1 before T2? (<image 1>)?
A. X=20, Y=30
B. X=50, Y=80
C. X=70, Y=50
D. None of the other answers

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val