Which web source citations are formatted according to mla guidelines? check all that apply.

“nelson mandela, anti-apartheid icon and father of modern south africa, dies.” karimi, faith. cnn. turner broadcasting. 5 dec. 2013. web. 1 mar. 2014.
“nelson mandela biography.” bio. com. a& e television networks, n. d. web. 28 feb. 2014.
hallengren, anders. “nelson mandela and the rainbow of culture.” nobel prize. nobel media, n. d. web. 1 mar. 2014.
“nelson mandela, champion of freedom.” history. the history channel. web. 1 mar. 2014.
“the long walk is over.” the economist. the economist newspaper, 5 dec. 2013. web. 1 mar. 2014.