Choose the right answer

1. Which of the following makes the <h2> elements on a page green?
   
   #h2 {color: green;}
   h2 {color: green;}
   .h2 {color: green;}
   <h2> {color: green;}
   
2. Which of the following are correct definition of id in html?
   
   <p id="rabbit song" >
   <p id="rabbit_song" >
   <p id="rabbit-song" >
   <p id="rabbitsong" >
   
3. Which of the following are correct uses of css rules?
   

     <style>
       #rabbit_song {color: green;}
     </style>
     ...
     <p id="rabbit_song" > ...
   

   
   

     <style>
       #rabbit song {color: green;}
     </style>
     ...
     <p id="rabbit song" > ...
   

   
   

     <style>
       #rabbit-song {color: green;}
     </style>
     ...
     <p id="rabbit-song" > ...
   

   
   

     <style>
       .rabbit-song {color: green;}
     </style>
     ...
     <p id="rabbit-song" > ...