假设需要为表customer添加主键约束，主键列为customer_id，可以使用如下（）方式。

A、AltertableCUSTOMERADDPK_CUSTOMERPRIMARYKEY("CUSTOMER_ID");;
B、AltertableCUSTOMERADDPRIMARYKEY("CUSTOMER_ID");;
C、AltertableCUSTOMERADDCONSTRAINTPK_CUSTOMER("CUSTOMER_ID");;
D、AltertableCUSTOMERADDCONSTRAINTPK_CUSTOMERPRIMARYKEY("CUSTOMER_ID");