The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered （） 60 seconds of touching the keypad.

A:only B:under C:within D:directly

The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered （） 60 seconds of touching the keypad.

A:only B:under C:within D:directly

The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered （） 60 seconds of touching the keypad.

A:only B:under C:within D:directly

The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered （） 60 seconds of touching the keypad.

A:only B:under C:within D:directly

The newly installed alarm system, which is directly connected to the police, will go off if the correct security code is not entered （） 60 seconds of touching the keypad.

A:only B:under C:within D:directly