How to launch application and bring it to front using Cocoa api?

To launch an application :

[[NSWorkspace sharedWorkspace] launchApplication:@"/Applications/Safari.app"];

To activate an app :

NSRunningApplication* app = [NSRunningApplication
                             runningApplicationWithProcessIdentifier: PID];
[app activateWithOptions: NSApplicationActivateAllWindows];
// or
NSArray* apps = [NSRunningApplication
                 runningApplicationsWithBundleIdentifier:@"com.bla.blah"];
[(NSRunningApplication*)[apps objectAtIndex:0]
 activateWithOptions: NSApplicationActivateAllWindows];

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