Which of the four control methods is best suited for rapid response to an input or output event?
1-programmed i/o
2- direct memory access
3- interrupt-driven i/o
4- channel i/o

1-Programmed I/O

Explanation:

The most appropriate way of doing it by using programmed I /O . This is because , the handler application as absolute control of sending data , and is synchronous in nature . All other I/O methods are asynchronous and the controlling / handler application has no idea about when the data transfer is going to complete .

answer; /// i believe the correct answer is people should evaluate different forms of savings vehicles based on their needs; good luck

answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

explanation: