Which of the following is suitable as a description of Unicode?
a) It is a 7-bit character code system established by ANSI (American National Standards Institute).
b) It is a character code system established as JIS (Japanese Industrial Standard). There is an 8-bit code for handling alphanumeric characters and katakana, and a 16-bit code for handling double-byte characters.
c) Unicode is also called extended Unix code. In it, double-byte characters and single- byte katakana characters are expressed in two or three bytes.
d) In order to handle characters for numerous countries, characters with similar shapes such as those in Japanese and Chinese are assigned to the same codes, and are expressed as two-byte character codes.