Which of the following statements is true ?

Both 1 and 2 are correct because , the electronic configuration of Au is given by  = Au = 4d¹⁰ 4f¹⁴ 6s¹.  The electronic configuration of Ag is given by = Ag = 4d¹⁰5s¹ . The electronic configuration of Cu is given by = Cu = 3d¹⁰ 4s¹   . The effective nuclear charge of Au increases  because of  poor shieiding effect  of 4f¹⁴  electrons (  lanthanoid contraction ) , due to which its ionization energy is higher in its group .  electronic configuration of Cu is given by  - 3d¹⁰4s¹ .  electronic configuration of K is given by - 4s¹3d⁰ . In Cu poor shielding effect of  3d¹⁰ electrons causes increase in effective nuclear charge and because of this IP value of Cu is greater than that of K . Hence, both the options are correct.