According to endosymbiosis theory, what is the most likely explanation for the origin of the two mitochondrial membranes

The endosymbiotic theory designates how a large host cell and consumed bacteria could simply become dependent on one different for survival, thus resulting in a permanent relationship. The explanation behind the origin of the two mitochondrial membranes is the inner membrane was derived from folding of the prokaryotic plasma membrane and the outer from folding in of the eukaryotic plasma membrane.