For each of the following $.$ Argue if it is true or not

a$)$ The chandy lamport algorithm for global snapshots may not work correctly for NON$-$FIFO channels

b$)$incremental checkpointing reduces MTTR compared to checkpointing the entire state

c$)$ Frequent checkpointing reduces MTTR

d$)$ Lineage based recovery $($a la spark$)$ is more efficient than checkpointing when failures are frequent