Choose the correct variant1. one of many telephone lines connected to a central system in a large building, which all have different numbers Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please. 2. the sound you hear when you pick up the telephone that lets you know that you can make a call Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please. 3. the button on a telephone that has the symbol (#) on it Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please. 4. When you call somebody by mistake you say Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please. 5. When you want somebody to return your call you say Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please. 6. When you finish the telephone conversation you Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please. 7. When you ask somebody on the phone to wait until the person they want to talk to is available you say Hold on, please.pound keyhang up the phoneextensionI think I have the wrong number.dial toneCall me back, please.