You can modify the backup retention period; valid values are 0 (for no backup retention) to a maximum of ___________ days.

When is the input message displayed in a cell that contains a validation rule?

A) When the user violates a rule B) When the workbook is opened C) When the cell is clicked D) When the cell is double-clicked

Given the following declarations, how would you know if head is pointing to an empty list?

struct NodeType { int number; NodeType* next; }; NodeType* head; //some other code here a. if(head->next == NULL) b. if(head == null) c. if( head == NULL) d. if( head->next==null); e. A and D f. B and C