Which of the following is a valid SQL statement? (refer to the tables in the JustLee Books database.)a. SELECT customer#, order#, MAX(shipdate-orderdate)FROM ordersGROUP BY customer#WHERE customer# = 1001;b. SELECT customer#, COUNT(order#)FROM ordersGROUP BY customer#;c. SELECT customer#, COUNT(order#)FROM ordersGROUP BY COUNT(order#);d. SELECT customer#, COUNT(order#)FROM ordersGROUP BY order#;

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