Kayla and jody are working at a station. they have been given four cards with four different functions on them.

function a function b function c function d
f(x)=2^x+1 f(x)=2(x‒1)^2 f(x)=2x+2 f(x)=2x^2‒1

kayla states that function d always exceeds the other functions. jody doesn't think kayla's statement is true. which values of x disproves her claim? explain your reasoning.