Correct

任选

/ rènxuǎn / 
Strokes

Definition

to choose arbitrarily/to take whichever one fancies

Example

As a Verb

take whichever one likes; freely choose; pick at random

1
Liǎngzhě
两者
rènxuǎn
任选
yī
一
gè
个

take either of the two

As an Adjective

optional