Option 1 states that 10% of jobs in Saudi Arabia should be reserved for Saudi nationals. This means that out of all the available job positions in the country, 10% should be set aside specifically for Saudi citizens. This decision is a result of the strict implementation of the Nitaqat law by the Saudi Arabian government.

Option 2, which states that 50% of jobs should be reserved for Saudi nationals, is not the correct answer. The correct answer is option 1, where only 10% of jobs need to be reserved for Saudi nationals.

Option 3 states that a foreigner will be allowed to work in Saudi Arabia for a maximum period of 10 years. This option is not mentioned in the question and is not part of the correct answer.

Option 4 states that foreigners` job contracts in Saudi Arabia will be on a year-to-year basis. This option is also not mentioned in the question and is not part of the correct answer.

In summary, the correct answer is option 1, as 10% of jobs in Saudi Arabia should be reserved for Saudi nationals according to the implementation of the Nitaqat law.