Which of the following statement is correct'? (Take, earth as a sphere of uniform density)

Acceleration due to gravity at altitude h,gh=g(1+h/R)2≈g1-2hR˙                                     …(i)At depth d,gd=g1-dR                                                             …(ii)In both Eqs. (i) and (ii), if  h  and d increases, g decreases.At latitude  ϕ,gϕ=g-ω2Rcos2ϕAs, ϕ increases, gϕ also increases.Thus, option (4) is correct but rest are incorrect.