您将使用哪个SQL语句来完成任务?

要在表CUSTOMERS的字段CUST_FIRST_NAME建个约束，使这个字段不能包含数字。您将使用哪个SQL语句来完成任务?

A.ALTER TABLE CUSTOMERS ADD CONSTRAINT cust_f_name CHECK(REGEXP_LIKE(cust_first_name,'[[:digit:]]')) NOVALIDATE;

B.ALTER TABLE CUSTOMERS ADD CONSTRAINT cust_f_name CHECK(REGEXP_LIKE(cust_first_name,'^AZ')) NOVALIDATE;

C.ALTER TABLE CUSTOMERS ADD CONSTRAINT cust_f_name CHECK(REGEXP_LIKE(cust_first_name,'[^0-9]')) NOVALIDATE;

D.ALTER TABLE CUSTOMERS ADD CONSTRAINT cust_f_name CHECK(REGEXP_LIKE(cust_first_name,'[[:alpha:]]')) NOVALIDATE;

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