to add session data one item at a time which code..., Validation, CodeIgniter

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Question:To add session data one item at a time, which code is used?

A $this->session->set_userdata('item_name','item_value'); 
B $data=array('username'=>'afzal', 'email'=>'afzal@yahoo.com','logged_in'=>TRUE);
$this->session->set_userdata($data); 
C $data=array( 'username'=>'afzal', 'email'=>'afzal@yahoo.com','logged_in'=>TRUE); 
D None

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Question:To add session data one item at a time, which code is used?

A $this->session->set_userdata('item_name','item_value');

B $data=array('username'=>'afzal', 'email'=>'afzal@yahoo.com','logged_in'=>TRUE); $this->session->set_userdata($data);

C $data=array( 'username'=>'afzal', 'email'=>'afzal@yahoo.com','logged_in'=>TRUE);

D None

A