What is the main purpose of the host$-$to$-$host layer? This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option. option A To shield the upper$-$layer applications from the complexities of the network option B To shield the data link$-$layer applications from the complexities of the network option C To shield the network$-$layer applications from the complexities of the network option D To shield the physical$-$layer applications from the complexities of the network