应诊断为

A．外痔

B．内痔

C．混合痔

D．直肠癌

E．直肠息肉

假如只想显示视图：EMPLOYEE_HIST的名字、视图的定义和视图定义的长度，请问应该使用以下SQL语句中的哪一个

A．SELECT
*
FROM
user_views
WHERE
view_name=’EMPLOYEE_HIST’;
B．SELECT
view_name, text, text_length
FROM
user_views
WHERE
view_name=’EMPLOYEE_HIST’;
C．SELECT
view_name, text, text_length
FROM VIEW
user_obiects
WHERE
view_name=’EMPLOYEE_HIST’;
D．SELECT VIEW
view_name, text, text_length
FROM
all_objects
WHERE
view_name=’EMPLOYEE_HIST’;