Consider the following statements. Which of them is /are incorrect?
a. By enabling INTE bit of an external interrupt can wake up the processor before entering into sleep mode.
b. INTF bit is set in INTCON only when a valid interrupt signal arrives at INT pin.
c. During the occurrence of interrupt, GIE bit is set in order to prevent any further interrupts.
d. goto instruction written in program memory cannot direct the program control to ISR.