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What are the intervals for which the function $f(x)=6\cos \pi x$ is decreasing?

$[ n,n+1 ] $, where $n$ is any integer.

$[ 2n,2n+1 ] $, where $n$ is any integer.

$[ n,2n+1 ] $, where $n$ is any integer.

$[ n+1, n ] $, where $n$ is any integer.