For the following code:

What line will verify that the text eneterd in this text field has three characters length $?$

Question options:

a$)$ document.getElementById$("$dd$").$length$==3$

b$)$ document.getElementById$("$dd$").$value.length$=3$

c$)$ document.getElementById$("$nn$").$value.length$==3$

d$)$ document.getElementById$("$dd$").$value.length$==3$

d$)$ lang$2="$C$++"$&years$3=$"more than $6"$