Q$1.$ Which of the following statements about the relationship between the US and Taiwan is INCORRECT?

A$.$ The US has always permitted an official political relationship with Taiwan.

B$.$ The US has always been the largest supplier of defensive arms to Taiwan.

C$.$ Former President Trump became the first sitting US president since Jimmy Carter

in $1979$ to have any formal political or diplomatic contacts with Taiwan when he decided to receive a phone call from President Tsai Ing$-$Wen.

D$.$ Former President Trump has expanded the duties of the US$\text{'}$ de facto embassy in Taipei$-$American Institute in Taiwan.