Which of the following is a valid way to initialize a variable in Go?

var x = 5
var x int = 5
x := 5
x int = 5

In Go, the short variable declaration x := 5 is a valid way to initialize a variable. This syntax allows you to declare and initialize a variable without explicitly specifying its type, relying on type inference. It's a concise and idiomatic way to initialize variables in Go.

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