There is a set of declarations. Some of them are invalid.
a)
val language = "Kotlin"
b)
val language
language = "Kotlin"
c)
val version: Int = "the newest one"
d)
val language: String
language = "Kotlin"
Match these declarations with their descriptions.
Tip: Type inference is a mechanism that automatically determines the type of variables. It works when you do not set the variable type manually.