【单选题】【消耗次数：1】
<img src=https://huaweicloudobs.ahjxjy.cn/14FE345B78024EC7B79C764AEB276B06.png title=G@YV9}C{]E$JJ4BY[4Q6N9T.png alt=G@YV9}C{]E$JJ4BY[4Q6N9T.png/>
①
上凹
②
下凹
③
既有上凹又有下凹
④
单调增加
参考答案：
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