const net = require('net');  const client = net.connect({port: 50302}, () => {//use same port of server    console.log('connected to server!');    client.write('world!\r\n');  });  client.on('data', (data) => {    console.log(data.toString());    client.end();  });  client.on('end', () => {    console.log('disconnected from server');  });

const net = require('net');  var server = net.createServer((socket) => {    socket.end('goodbye\n');  }).on('error', (err) => {    // handle errors here    throw err;  });  // grab a random port.  server.listen(() => {    address = server.address();    console.log('opened server on %j', address);  });

How do you start a server listening on port 3000 in Express?app.start(3000, () => { console.log('Server running'); })app.run(3000, () => { console.log('Server running'); })app.listen(3000, () => { console.log('Server running'); })app.launch(3000, () => { console.log('Server running'); })

const handleSubmit = (e) => { e.preventDefault(); const userData = { username, email, password }; fetch('http://localhost:8080/signup', { method: 'POST', headers: { 'Content-Type': 'application/json', }, body: JSON.stringify(userData), }) .then((response) => { if (!response.ok) { throw new Error('Network response was not ok'); } return response.json(); }) .then((data) => { console.log('Success:', data); }) .catch((error) => { console.error('Error:', error); }); };

4. Create a small HTTP server using Node's HTTP modulemandatoryScore: 0.0% (Checks completed: 0.0%)In a file named 4-http.js, create a small HTTP server using the http module:It should be assigned to the variable app and this one must be exportedHTTP server should listen on port 1245Displays Hello Holberton School! in the page body for any endpoint as plain textIn terminal 1:

While working on an Hyperledger Fabric app, the user writes a node.js server in the index.js file.Which of the following syntaxes should be used here to create a server over port 3000?let port = process.env.PORT || 3000;<br /> app.listen(port, () => console.log(‘port for server listening is ${port}….’));let port = process.sys.PORT || 3000;<br /> app.get(port, () => console.log(‘port for server listening is ${port}….’));let port = process.sys.PORT && 3000;<br /> app.listen(port, () => console.log(‘port for server listening is ${port}….’));let port = process.env.PORT && 3000;<br /> app.get(port => console.log(‘port for server listening is ${port}….’));