These studies demonstrated the difficulty the designers faced. With a displacement of 35,000 tons, there were two basic choices: a ship similar to "A1" which was faster (30 knots) but more lightly armed and armored than contemporary battleships or one which was slower but armed with heavier guns—although fitting in protection against 16-inch guns would be extremely difficult. Preliminary Design drew up five more studies in October, based upon either "A" with additional armor or a scaled-down "B"; all used 14-inch guns and called for 30 or 30.5 knots. Two called for four turrets, but this would be too heavy and mount less armor. Another, "K," belt and deck and a immune zone against the United States' super-heavy 14-inch shell. While "K" was liked by the naval constructors, its designed standard displacement of 35,000 tons left little room for error or any modifications and improvements to the design. A final two, "L" and "M," would use quadruple turrets to save weight (similar to the French ) while still mounting 12 guns.