Heat transfer. Select in which conditions this equation can be used: T (k)+ =0 z gen 1 (kr - r r T -) + r z A 3D steady conduction with heat generation and variable thermal conductivity B) 2-D transient conduction with heat generation and constant thermal conductivity (C) 2-D steady conduction with heat generation and constant thermal conductivity 2-D steady conduction with heat generation and variable thermal conductivity E 2-D transient conduction with heat generation and variable thermal conductivity