Which equation represents Brocard's Problem?
n!+1=m2n! + 1 = m^2n!+1=m2
xn+yn=znx^n + y^n = z^nxn+yn=zn
y2=x3−ky^2 = x^3 - ky2=x3−k
x2−Dy2=1x^2 - Dy^2 = 1x2−Dy2=1