Give the operating modes of 8259a?
(a) Automatic Rotation
(b) End of Interrupt (EOI)
(c) Fully Nested Mode
(d) Automatic EOI Mode
(e) Specific Rotation
(f) Edge and level Triggered Mode
(g) Special Mask Mode
(h) Reading 8259 Status
(i) Poll command
(j) Special Fully Nested Mode
(k) Buffered mode
(l) Cascade mode