74. Unions-II

Question.7

A developer builds a control register overlay to set individual fields and read/write the full register as one byte:

typedef ___ {
   struct {
       uint8_t EN   : 1;
       uint8_t MODE : 2;
       uint8_t IRQ  : 1;
       uint8_t      : 4;
   } bits;
   uint8_t value;
} CtrlReg;

What keyword goes in the blank?

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union
struct
enum
typedef