Which of the following defines "closure" in Go ? (select all that apply)

the Go equivalent of "class", allowing bundling of data structures with manipulation code

a collection of goroutines that can be proven to have no race conditions

a compile time feature whereby the compiler completes code fragments into fully specified instructions, similar to "macro"

bundling a function with the referencing environment that exists when it is defined, so it executes correctly when called

higher order function where a function manufactures and returns another function