Question: Which of the following is a valid SQL statement? a. ALTER TABLE secustomersspent ADD DATE lastorder; b. ALTER TABLE secustomerorders DROP retail; c. CREATE TABLE

Which of the following is a valid SQL statement?
a. ALTER TABLE secustomersspent ADD DATE lastorder;
b. ALTER TABLE secustomerorders DROP retail;
c. CREATE TABLE newtable AS(SELECT * FROM customers);
d. ALTER TABLE drop column *;

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