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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