Junanke III 167 Which line is simple?

Jun 'an Zhisan 167, 1 line is simple. According to relevant information, there are three test lines in Junan, namely 1, Line 6 and Line 7. The order of the difficulty of the three routes is 1 line is simple, line 7 is medium, and line 6 is the most difficult, so 1 line is simple.