Operational decisions are often $\_\_1\_\_$ decisions and $\_\_2\_\_$ systems support them.

a$)1$: semi$-$structured; $2$: transaction processing

b$)1$: semi$-$structured; $2$: decision support

c$)1$: unstructured; $2$: transaction processing

d$)1$: structured; $2$: transaction processing

e$)1$: structured; $2$: decision support

f$)1$: unstructured; $2$: decision support