For what value of kkk is the following function continuous at x=1x = 1x=1? f(x)={kx+2x≤1x2+3x>1f(x) = \begin{cases} kx + 2 & x \leq 1 \\ x^2 + 3 & x > 1 \end{cases}f(x)={kx+2x2+3x≤1x>1
k=1k = 1k=1
k=2k = 2k=2
k=3k = 3k=3
k=−2k = -2k=−2