Which CREATE TABLE statement is valid?
A. CREATE TABLE ord_details (ord_no NUMBER(2) PRIMARY KEY, item_no NUMBER(3) PRIMARY KEY, ord_date date NOT NULL);
B. CREATE TABLE ord_details(ord_no NUMBER(2) UNIQUE, NOT NULL,item_no NUMBER(3),ord_date date DEFAULT SYSDATE NOT NULL);
C. CREATE TABLE ord_details (ord_no NUMBER(2) , item_no NUMBER(3),ord_date date DEFAULT NOT NULL, CONSTRAINT ord_uq UNIQUE (ord_no), CONSTRAINT ord_pk PRIMARY KEY (ord_no));
D. CREATE TABLE ord_details (ord_no NUMBER(2), item_no NUMBER(3),ord_date date DEFAULT SYSDATE NOT NULL, CONSTRAINT ord_pk PRIMARY KEY (ord_no, item_no));
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