The operator $$\bigtriangleup$$ acts on two numbers to give the following outcomes:  $$3 \bigtriangleup 2 = 12$$  $$4 \bigtriangleup 5 = 40$$  $$5 \bigtriangleup 9 = 90$$  $$6 \bigtriangleup 1 = 12$$  What is $$2 \bigtriangleup 7$$ equal to? 
选项为:A:$$14$$  B:$$20$$  C:$$24$$  D:$$28$$  E:None of the above  请回答其中一个选项.