Please answer a question about the following article about BeiDou Navigation Satellite System:

The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: ; traditional Chinese: ; pinyin: Beidou weixing daohang shiyan xitong) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has been offering navigation services, mainly for customers in China and neighboring regions, since 2000.

What was the first BeiDou system called?
the BeiDou Satellite Navigation Experimental System