Answer:
a. Flagella
Step-by-step explanation:
Salmonella spp. is a motile enterobacteria with peritrichous flagella surrounding round the body of the bacterial organism. It is a type of bacterial infection that affects the walls of the gastrointestinal tracts. Movement in the gastrointestinal tracts is aided by the use of whip-like structure known as flagella and the use it as a defense mechanism from their host cells when they are about to be phagocytosized.
Phagocytosis is the action of using the plasma membrane to engulf a large partice, substance or organism in the cell.