As per the below JavaScript code snippet, predict the output. 

let student = { name: "John", rank: "3", course: null } 
let { rank, course} = student; 
if (rank !== 3) { 
	if (typeof(course) === null) { 
		console.log("HTML"); 
	} 
	else if (typeof course !== "object") {
		console.log("CSS"); 
	} 
	else { 
		console.log("JavaScript"); 
	} 
} 
else { 
	console.log("Bootstrap"); 
}

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