Memory Access-self doubt

Question

what is the number of memory accessed required in

1. register indirect mode
2. index register mode
3. base register mode

pls explain in details with examples

Answer 1

Not sure
but I think
for INDIRECT its 2 Memory accesses= 1 as EA refernce to get the EA and 2nd as Operand fetch to get the actual operand from EA

in INDEX and BASE - its same as direct so 1 in each
someone please confirm..

Answer 2

register indirect mode > 2 //1 for instruction + 1 for operand address

index register mode    > 1 // 1 for instruction

base register mode     > 1 // 1 for instruction