Correct

稽考

/ jī kǎo / 
Strokes

Example

As a Verb

ascertain; verify

1
Niánshēnrìjiǔ
年深日久
  
,
cǐshì
此事
wúcóng
无从
jīkǎo
稽考
  
。

As it happened such a long time ago, the matter is hard to verify.

2
Wúcóng
无从
jīkǎo
稽考

be unverifiable/unascertainable