Which of the following calculations is correct? 
选项为:A:$${(\frac{1}{2})}^{2}-{(\frac{1}{2})}^{3}=\frac{1}{4}$$  B:$$a^{100}\cdot a^{100}=2a^{100}$$  C:$$\frac{3^{1080}}{3^{1080}}=0$$  D:$$3^{44}\cdot 3^{33}=3^{77}$$  请回答其中一个选项.