Which of the following is mentioned as a plan of Al-Qaeda?

The authorities in Saudi Arabia say they’ve arrested more than 100 militants suspected of links to Al-Qaeda who were planning to attack oil installation in the kingdom. The Saudi Interior Ministry says half of those detained are Saudis and the others are from Yemen, Bangladesh, Somalia and Eritrea. Official say security forces seized weapons, cameras, computers and documents.
    The latest round of arrests suggests militants are crossing from neighbouring Yemen and using Saudi connections to block attacks. The Saudi Interior Ministry spokesman Mansur al-Turki said that the two cells dismantled by the security forces were cooperating Al-Qaeda and Yemen. In addition he said a network of militancy specializing and targeting security personnel has been broken. Mr. Turki said that militants from network and the two cells would be in contact with Al-Qaeda and Yemen and planning to attack oil facilities.