[单选] Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）

A . Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.
B . Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).
C . Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.
D . Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.

某人准备从A公司跳槽到B公司，期间有一段时间在休息，这个人属于结构性失业。 A client has bought an IBM System Storage DS8000 and needs to attach a Sun Solaris Host with 2 HBAs via one fabric to 4 I/O ports on the DS8000. The client needs redundant paths to the volumes on the DS8000. What is the maximum number of volumes that can be used on the Solaris host（） 256。 512。 1024。 2048。乞题谬误又被称为（）。前提谬误。结论谬误。支持谬误。循环论证。建设工程项目的管理核心是（）。设计方的项目管理。业主方的项目管理。施工方的项目管理。监理方的项目管理。按照功能差异或社区主要活动的特点来划分，社区可以分为（）。自然社区。行政型社区。人为规定的社区。文化型社区。 Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）

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[单选] Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）

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