Write a C progrram, uni.c, which reads a given file using Unix open()/read() system calls as well as C fopen()/fgetc()/fread() functions and measure how long it takes to finish reading the file.

• open: is a Unix system call that opens a given file.

• read: is a Unix system call that reads a file into a given buffer.

• close: is a Unix system call that closes a given file.

• fopen: is a C standard I/O function that opens a given file.

• fgetc: is a C standard I/O function that reads one byte from a file.

• fread: is a C standard I/O function that reads a file into a given data structure.

• fclose: is a C standard I/O function that closes a give file.