The inventory method in which supplies are made only at the time of requirement is called:

Select one:

a$.$

LEAN

b$.$

First$-$in$,$ First$-$Out $($FIFO$)$

c$.$

Last$-$in$,$ First$-$Out $($LIFO$)$

d$.$

Just$-$in$-$Time $($JIT$)$