How many constructors are there in the following UML diagram?

Student

name : String

id : int

score: double

$+$Student$()$

$+$Student$($n:String$)$

$+$Student$($i:int, s:double$)$

$+$Student$($s:double$)$

printInfo$()$ : void

A$.0$

B$.1$

C$.3$

D$.4$

E$.5$