Concept:The =NOW() function in Excel returns the current date and time based on your computer’s system clock. It is a volatile function that updates automatically whenever the worksheet recalculates.Explanation:=NOW() does not take any arguments. Its output includes both the current date and the current time together. The display format depends on the cell’s formatting: if formatted for date, only the date is shown; if for time, only the time is shown. However, the function itself always returns both. Unlike =TODAY(), which returns only the date with time set to 12:00 AM, =NOW() gives the exact current date and time. This function is useful for dynamic timestamps, time calculations, and conditional formatting in reports.Answer:C. Both current date and time