Correct

落款

/ luòkuǎn / 
Strokes

Definition

inscription with name, date, or short sentence, on a painting, gift, letter etc

Example

As a Noun

names of the sender and the recipient written on a painting, gift or letter

1
Zhè
这
shì
是
bìjiāsuǒ
毕加索
de
的
zuòpǐn
作品
  
,
dàn
但
méiyǒu
没有
luòkuǎn
落款
  
。

The painting was by Picasso, but it wasn't signed.

As a Verb

sign one's name

2
Tā
他
gāng
刚
wánchéng
完成
zhè
这
fú
幅
huà
画
  
,
hái
还
mò
没
luòkuǎn
落款
  
。

He has just finished the painting and hasn't signed his name.

3
Qǐng
请
zài
在
zhèrluò
这儿
kuǎn  
落款
  
。

Sign here/Sign your name here, please.

4
Xìn
信
shì
是
shuí
谁
luò
落
de
的
kuǎn
款
  
?

Who signed the letter?