Are there exactly 3 distinct symbols used

问题：

Are there exactly 3 distinct symbols used to create the code words in language Q ？（）
(1)The set of all code words in language Q is the set of all possible distinct horizonal arrangements of one or more symbols, with no repetition.
(2)There are exactly 15 code words in language Q.

A.条件（1）充分，但条件（2）不充分.

B.条件（2）充分，但条件（1）不充分.

C.条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.

D.条件（1）充分，条件（2）也充分.

E.条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.