Only the third reaction will occur:
2AgNO3 + Ni = Ni(NO3)2 + 2Ag. The more active metal Ni replace less active metal Ag from the salt.
The first reaction is impossible, because iodide can't replace bromide from the salt
The second reaction is impossible, because Fe is less active metal than Al.
The last reaction is also impossible, because Pb is less active metal than Zn.
