关于曲线的凹凸性,下列说法错误的是( ).
A、曲线<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16206272143119ae7871b594e48e9b86a97afda24fe3cimage30.png"style="width:53px;height:21px;"/>在定义域内是凹的.
B、曲线<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627214348a5add661d0e94b52a5ec3ecbbc0d8216image31.png"style="width:42px;height:24px;"/>在定义域内是凹的.
C、曲线<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627214380e24ed39c63414a9989990e84337ec42eimage32.png"style="width:42px;height:24px;"/>在<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16206272144152cca209e30e64f53bdf1f8c3718611efimage33.png"style="width:50px;height:26px;"/>内是凹的
D、曲线<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16206272144504e33a1bc81dc48d8bcf09d02fab793bbimage32.png"style="width:42px;height:24px;"/>在<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627214487fc134fcf3df0400dbe7e5dba82198267image34.png"style="width:50px;height:26px;"/>内是凸的.
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