The correct option is dotnet nuget push "publish/Release/MonolithApp2.1.2.0.nupkg" --api-key PAT_TOKEN --source "acme".

The dotnet nuget push "publish/Release/MonolithApp2.1.2.0.nupkg" --api-key PAT_TOKEN --source "acme" command is the proper way to publish a built .nupkg to a NuGet feed. The command takes the package file path, an API key for authentication and a source which can be a feed name or feed URL, so replacing PAT_TOKEN with a valid key and pointing --source to the Acme feed will upload the package.

gcloud artifacts packages upload "publish/Release/MonolithApp2.1.2.0.nupkg" --location us-central1 --repository acme-repo --format nuget is incorrect because the typical approach to publish NuGet packages to a NuGet feed is to use the NuGet client such as dotnet nuget push. The gcloud command is not the standard client operation for pushing a .nupkg to a NuGet feed.

dotnet nuget add source "publish/Release/MonolithApp2.1.2.0.nupkg" --api-key PAT_TOKEN --source "acme" is incorrect because add source registers a feed endpoint with your NuGet configuration and it expects a feed URL not a package file path. It does not upload a package.

git nuget push "publish/Release/MonolithApp2.1.2.0.nupkg" --api-key PAT_TOKEN --source "acme" is incorrect because there is no standard git nuget push command and mixing git with nuget in that form is not a valid way to publish a NuGet package. The supported client is the NuGet CLI or the dotnet tool.

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