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單項(xiàng)選擇題

lisa is writing a formula to determine the number of elements in a list. she wants to ensure that a value is returned, even if the value her function is evaluating turns out to be a null string . which one of the following can she so to accomplish this ?()

A.use a defaule formula of 1 
B.use @elements and add 1 to the total 
C.use the @count function instead of @elements 
D.use @texttotime to ensure that all strings arte converted to date-time values 

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