Correct

叩打

/ kòu dá / 
Strokes

Example

As a Verb

knock; tap; rap

1
Lǎoshī
老师
yòng
用
shǒuzhǐ
手指
kòu
叩
dá
打
zhāo
着
bàngōngzhuō
办公桌
  
。

The teacher tapped the desk with her fingers.